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Full vulnerability report · 2026
CVE-2026-64902High confidence

Microsoft SharePoint Server Spoofing Vulnerability

Microsoft · Microsoft SharePoint Enterprise Server 2016

4.6MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

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-2026-56703

No EUVD known-exploited evidence

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
4.6 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

What

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

Why

Attacker-controlled content can reach a browser as executable script without sufficient output encoding or sanitisation.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

Why

Attacker-controlled content can reach a browser as executable script without sufficient output encoding or sanitisation.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

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 → Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
Required interaction required
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-79 ↗

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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:L/UI:R/S:U/C:L/I:L/A:N/E:U/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.PRLowPrivileges required: The attacker needs basic user-level privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-79
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-56703Official EUVD mapping

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

Official EUVD record
BSI · German · WID-SEC-W-2026-2762Microsoft Office Produkte: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Office Produkte ausnutzen, um Dateien zu manipulieren, um seine Privilegien zu erhöhen, um Informationen offenzulegen, um einen Cross-Site Scripting Angriff durchzuführen, und um beliebigen Programmcode auszuführen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1004Multiples vulnérabilités dans les produits Microsoft

ulletin de sécurité Microsoft CVE-2026-62914 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-62915 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-62917 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-63512 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-63514 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-63516 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-63520 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-64897 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-64900 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-64901 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-64902 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-64916 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-64921 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-64922 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-65658 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-65660 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-65663 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-65665 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-65673 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-65675 du 11 août 2026 Bulletin de sécurité Microsoft CVE-2026-65680 du 11 août 2026 Bulletin de s

Official advisory
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-23Aggiornamenti Mensili Microsoft

nuova finestra - - CVE-2026-64917 : apre una nuova finestra - - CVE-2026-64916 : apre una nuova finestra - - CVE-2026-64915 : apre una nuova finestra - - CVE-2026-64914 : apre una nuova finestra - - CVE-2026-64912 : apre una nuova finestra - - CVE-2026-64911 : apre una nuova finestra - - CVE-2026-64910 : apre una nuova finestra - - CVE-2026-64909 : apre una nuova finestra - - CVE-2026-64908 : apre una nuova finestra - - CVE-2026-64907 : apre una nuova finestra - - CVE-2026-64906 : apre una nuova finestra - - CVE-2026-64905 : apre una nuova finestra - - CVE-2026-64904 : apre una nuova finestra - - CVE-2026-64903 : apre una nuova finestra - - CVE-2026-64902 : apre una nuova finestra - - CVE-2026-64901 : apre una nuova finestra - - CVE-2026-64900 : apre una nuova finestra - - CVE-2026-64899 : apre una nuova finestra - - CVE-2026-64898 : apre una nuova finestra - - CVE-2026-64897 : apre una nuova finestra - - CVE-2026-63533 : apre una nuova finestra - - CVE-2026-63532 : apre una nuova finestra - - CVE-2026-63531 : apre una nuova finestra - - CVE-2026-63530 : apre una nuova finestra - - CVE-2026-63529 : apre una nuova finestra - - CVE-2026-63528 : apre una nuova finestra - - CVE-2026-63527 : apre una nuova finestra - - CVE-2026-63526 : apre una nuova finestra - - CVE-2026-63525 : apre una nuova fi

Official advisory
NCSC-NL · Dutch · NCSC-2026-0286Kwetsbaarheden verholpen in Microsoft Office

Microsoft Office SharePoint contains a cross-site scripting vulnerability due to improper input neutralization during web page generation, enabling authorized attackers to perform network-based spoofing.

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
16.0.0 < 16.0.5565.1001; 16.0.0 < 16.0.10417.20198; 16.0.0 < 16.0.19725.20522
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 11 Aug 2026 · Last source change 8 Sept 2026, 17:33 UTC · CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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-2026-56703
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 →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-56703↗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-2026-64902 · cve.blacktree.nl