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Full vulnerability report · 2026
CVE-2026-58644High confidence

Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Microsoft · SharePoint

9.8CriticalCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2026-07-19 as the remediation due date.

Patch available
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-43779

CISA KEV mirrored by ENISA

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 16 Jul 2026. Evidence sources: cisa_kev.
ENISA score
9.8 · CVSS 3.1
Advisory evidence
2 linked advisory records
Explicit mitigation evidence

Only statements that explicitly mention a fix, patch, update, workaround or mitigation are shown here.

  • csaf_ncscnl · NCSC-2026-0237Kwetsbaarheden verholpen in Microsoft Office
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2026-07-19 as the remediation due date.

Patch available
01

What, why and how

Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.

What

Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

What

Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2026-07-16.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Deserialization of Untrusted Data → execute code or commands in the affected security context
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-502 ↗

CWE-502: Deserialization of Untrusted Data. The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkUnauthenticatedRemote code executionCWE-502CISA KEV
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-43779Known-exploited evidence recorded

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

Official EUVD record ↗
BSI · German · WID-SEC-2026-2317Microsoft Office Produkte: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in verschiedenen Microsoft Office Produkten ausnutzen, um beliebigen Programmcode auszuführen, um Informationen offenzulegen, um falsche Informationen darzustellen, um seine Privilegien zu erhöhen, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
Canadian Centre for Cyber Security · English · AL26-017AL26-017 - Critical vulnerabilities impacting Microsoft SharePoint Server – CVE-2026-56164, CVE-2026-55040 and CVE-2026-58644

An Alert is used to raise awareness of a recently identified cyber threat that may impact cyber information assets, and to provide additional detection and mitigation advice to recipients. The Canadian Centre for Cyber Security (Cyber Centre) is also available to provide additional assistance regarding the content of this Alert upon request.

Official advisory ↗
Canadian Centre for Cyber Security · English · AV26-698Microsoft security advisory – July 2026 monthly rollup (AV26-698) – Update 3

On July 14, 2026, Microsoft published security advisories to address vulnerabilities in multiple products. Included were critical updates for the following products: Microsoft has indicated that CVE-2026-56164 and CVE-2026-56155 are being exploited.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260715Security Bulletin 15 Jul 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 15 Jul 2026, published on 15 July 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0872Multiples vulnérabilités dans les produits Microsoft

CVE-2026-56157 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-56164 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-56178 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-56192 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-56642 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-57101 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-57102 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-58277 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-58595 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-58636 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-58644 du 14 juillet 2026 Bulletin de sécurité Microsoft CVE-2026-58647 du 14 juillet 2026 Une gestion de version détaillée se trouve à la fin de ce document. Risques Atteinte à l'intégrité des données Atteinte à la confidentialité des données Contournement de la politique de sécurité Déni de service à distance Exécution de code arbitraire à distance Élévation de privilèges Systèmes affectés Age of Empires II: Definitive Edition Game versions antérieures à 101.103.46651.0 Fabric Data Warehouse versions antérieures à 8.0.206.113 GitHub Copilot Plugin pour JetBrains IDEs versions antérieures à 1.13.0-251 Microsoft Bing Search pour iOS versions antéri

Official advisory ↗
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-22Aggiornamenti Mensili Microsoft

iver Windows Unified Consent System Windows Universal Disk Format File System Driver (UDFS) Windows User Interface Core Windows VMSwitch Windows Virtual Filtering Platform (VFP) Windows WalletService Windows Web Proxy Auto-Discovery Protocol (WPAD) Windows WebView Windows Win32K Windows Win32K - GRFX Windows Wireless Networking Windows Wireless Wide Area Network Service Azioni di mitigazione In linea con le dichiarazioni del vendor, si raccomanda di procedere all’aggiornamento dei prodotti impattati attraverso l’apposita funzione di Windows Update. CVE (622) Cerca: Tabella CVE CVE POC EXPLOITATION CVE-2026-58647 : apre una nuova finestra - - CVE-2026-58644 : apre una nuova finestra - - CVE-2026-58640 : apre una nuova finestra - - CVE-2026-58638 : apre una nuova finestra - - CVE-2026-58637 : apre una nuova finestra - - CVE-2026-58636 : apre una nuova finestra - - CVE-2026-58635 : apre una nuova finestra - - CVE-2026-58634 : apre una nuova finestra - - CVE-2026-58633 : apre una nuova finestra - - CVE-2026-58632 : apre una nuova finestra - - CVE-2026-58631 : apre una nuova finestra - - CVE-2026-58629 : apre una nuova finestra - - CVE-2026-58628 : apre una nuova finestra - - CVE-2026-58627 : apre una nuova finestra - - CVE-2026-58626 : apre una nuova finestra - - CVE-2026-58619 : apre una nuova fi

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-023915マイクロソフトのMicrosoft SharePoint Serverにおける信頼できないデータのデシリアライゼーションに関する脆弱性

Microsoft Office SharePointにおける信頼されていないデータの逆シリアル化の脆弱性により、不正な攻撃者がネットワーク経由でコードを実行できる可能性があります。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6885美 CISA 발표 주요 Exploit 정보공유(Update. 2026-07-16)

Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6882MS 7월 보안 위협에 따른 정기 보안 업데이트 권고

서비스 정보 유출 취약성 | | Windows PowerShell | CVE-2026-40400 | Windows PowerShell 원격 코드 실행 취약성 | | Windows File Explorer | CVE-2026-41087 | Windows 파일 탐색기 정보 공개 취약성 | | Windows File Explorer | CVE-2026-40422 | Windows 파일 탐색기 정보 공개 취약성 | | Windows Audio Service | CVE-2026-34328 | Windows 오디오 서비스 정보 유출 취약성 | | Windows File Explorer | CVE-2026-33842 | Windows 파일 탐색기 정보 공개 취약성 | | Azure Active Directory | CVE-2026-50653 | Azure Active Directory 서비스 거부 취약성 | | Azure Active Directory | CVE-2026-50652 | Azure Active Directory 서비스 거부 취약성 | | Power BI | CVE-2026-58647 | Microsoft PowerBI Report Server Spoofing Vulnerability | | Microsoft Office SharePoint | CVE-2026-58644 | Microsoft SharePoint 원격 코드 실행 취약성 | | Windows NTFS | CVE-2026-58640 | Windows NTFS 원격 코드 실행 취약성 | | Window PC Manager | CVE-2026-58636 | Microsoft PC Manager 권한 상승 취약성 | | Windows Narrator Braille | CVE-2026-58635 | Windows Narrator Braille 권한 상승 취약성 | | Windows Admin Center | CVE-2026-58631 | Windows Admin Center(WAC) 원격 코드 실행 취약성 | | Microsoft Office Excel | CVE-2026-58618 | Microsoft Excel 원격 코드 실행 취약성 | | Microsoft Configuration Manager | CVE-2026-47301 | 구성 관리자 권한 상승 취약성 | | Windows Kernel | CVE-2026-58614 | Windows 커널 보안 기능 우회 취약성 | | Microsoft Windows Media Foundation | CVE-2026-58610 | Windows 미디어 파운데이션 원격 코드 실행 취약성 | | Microsoft G

Official advisory ↗
NCSC-NL · Dutch · NCSC-2026-0237Kwetsbaarheden verholpen in Microsoft Office

Een kwaadwillende kan de kwetsbaarheden misbruiken om aanvallen uit te voeren die kunnen leiden tot categorieën schade, zoals benoemd in onderstaande tabel. Voor succesvol misbruik moet de kwaadwillende het slachtoffer misleiden een malafide bestand te openen of link te volgen, met uitzondering van SharePoint. Voor succesvol misbruik van kwetsbaarheden in SharePoint is geen gebruikersinteractie nodig, anders dan het volgen van een malafide link. Microsoft heeft in een update bevestigd dat SharePoint kwetsbaarheid CVE-2026-58644 actief als zeroday is misbruikt. Het NCSC raadt aan kwetsbare SharePoint systemen zo snel mogelijk te updaten naar de nieuwste versie om misbruik te voorkomen. De kwetsbaarheid CVE-2026-58644 betreft een deserialization-kwetsbaarheid welke misbruik zou kunnen worden om op afstand code uit te voeren. Mogelijk is de kwetsbaarheid CVE-2026-58644 in combinatie met SharePoint-kwetsbaarheid CVE-2026-56164 door kwaadwillende te misbruiken om zonder authenticatie op afstand code uit te voeren. De kwetsbaarheid CVE-2026-56164 betreft een privilegeescalation-kwetsbaarheid, deze zou misbruikt kunnen worden om rechten binnen een netwerk te verhogen. UPDATE: Volgens watchTowr is er een publieke exploit code voor SharePoint kwetsbaarheid CVE-2026-50522 gepubliceerd en wordt deze op on-premise versies van SharePoint nu ook actief misbruikt. Kwaadwillenden kunnen deze kwetsbaarheid misbruiken om zichzelf voor langere termijn toegang tot netwerken van kwetsbare systemen te verschaffen, door middel van het stelen van machine-keys. ``` Microsoft Office SharePoint: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-54108 | 6.50 | Voordoen als andere gebruiker | | CVE-2026-56164 | 5.30 | Verkrijgen van verhoogde rechten | | CVE-2026-50522 | 9.80 | Uitvoeren van willekeurige code | | CVE-2026-58644 | 9.80 | Uitvoeren van willekeurige code | | CVE-2026-55016 | 4.60 | Voordoen als andere gebruiker | | CVE-2026-55019 | 4.60 | Voordoen als andere gebruiker | | CVE-2026-55020 | 4.60 | Voordoen als andere gebruiker | | CVE-2026-55021 | 7.30 | Voordoen als andere gebruiker | | CVE-2026-55030 | 4.60 | Voordoen als andere gebruiker | | CVE-2026-55034 | 7.30 | Voordoen als andere gebruiker | | CVE-2026-55126 | 7.30 | Voordoen als andere gebruiker | | CVE-2026-55051 | 6.50 | Toegang tot gevoelige gegevens | | CVE-2026-55040 | 9.10 | Omzeilen van beveiligingsmaatregel | | CVE-2026-55052 | 8.80 | Verkrijgen van verhoogde rechten | | CVE-2026-55135 | 4.60 | Voordoen als andere gebruiker | | CVE-2026-56157 | 5.40 | Voordoen als andere gebruiker | | CVE-2026-58277 | 8.80 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Microsoft Office Word: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-55050 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55032 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55033 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55124 | 5.50 | Uitvoeren van willekeurige code | | CVE-2026-55127 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55055 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55038 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55132 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55134 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55142 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55128 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55130 | 7.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Microsoft Office PowerPoint: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-55043 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55123 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55120 | 7.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Microsoft Office: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-56193 | 7.10 | Toegang tot gevoelige gegevens | | CVE-2026-47290 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-50301 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-50314 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-50467 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55017 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55018 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55022 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55023 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55125 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55026 | 6.20 | Toegang tot gevoelige gegevens | | CVE-2026-55027 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55028 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55047 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55045 | 8.40 | Uitvoeren van willekeurige code | | CVE-2026-55049 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55129 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55035 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55057 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55056 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55140 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55042 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55139 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-50665 | 7.80 | Toegang tot gevoelige gegevens | | CVE-2026-56192 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-56195 | 5.50 | Toegang tot gevoelige gegevens | |----------------|------|-------------------------------------| Microsoft Office OneNote: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-55133 | 7.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Microsoft Office Excel: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-50675 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-50678 | 6.60 | Toegang tot gevoelige gegevens | | CVE-2026-54988 | 6.10 | Toegang tot gevoelige gegevens | | CVE-2026-55899 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55948 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-58618 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-47642 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-48580 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55024 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-50408 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55046 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55025 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55031 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55048 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55029 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55039 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55041 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55138 | 5.50 | Toegang tot gevoelige gegevens | | CVE-2026-55136 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55141 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55036 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55044 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55054 | 6.50 | Toegang tot gevoelige gegevens | | CVE-2026-55037 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55058 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55137 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55053 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55122 | 7.10 | Toegang tot gevoelige gegevens | | CVE-2026-55131 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-54131 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55898 | 6.10 | Toegang tot gevoelige gegevens | | CVE-2026-55947 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-55949 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-56156 | 7.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Windows GDI: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-50387 | 7.80 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| ```

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 14 Jul 2026 · Last source change 28 Aug 2026, 17:51 UTC · CWE-502 · Deserialization of Untrusted Data

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-43779
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    16.0.0 < 16.0.5556.1005; 16.0.0 < 16.0.10417.20153; 16.0.0 < 16.0.19725.20384 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Microsoft SharePoint Enterprise Server 2016: 16.0.0 < 16.0.5556.1005; Microsoft SharePoint Server 2019: 16.0.0 < 16.0.10417.20153; Microsoft SharePoint Server Subscription Edition: 16.0.0 < 16.0.19725.20384 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  2. BlackTree coverageBlackTree article coverage changed from no BlackTree article to 1 BlackTree article.
    Before
    no BlackTree article
    After
    1 BlackTree article
    BlackTree editorial ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-43779↗CISA KEV record↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-58644 · cve.blacktree.nl