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Full vulnerability report · 2026
CVE-2026-66306High confidence

Skype for Business Information Disclosure Vulnerability

Microsoft · Skype for Business Server 2015 CU13

6.5MediumCVSS 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-2026-73934

No EUVD known-exploited evidence

Generation of error message containing sensitive information in Skype for Business allows an unauthorized attacker to disclose information 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
6.5 · 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

Generation of error message containing sensitive information in Skype for Business allows an unauthorized attacker to disclose information over a network.

What

Generation of error message containing sensitive information in Skype for Business allows an unauthorized attacker to disclose information over a network.

Why

The product generates an error message that includes sensitive information about its environment, users, or associated data.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may obtain information outside the intended access boundary.

What

Generation of error message containing sensitive information in Skype for Business allows an unauthorized attacker to disclose information over a network.

Why

The product generates an error message that includes sensitive information about its environment, users, or associated data.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may obtain information outside the intended access boundary.

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 → Generation of Error Message Containing Sensitive Information → obtain information outside the intended access boundary
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
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-209 ↗

CWE-209: Generation of Error Message Containing Sensitive Information. The product generates an error message that includes sensitive information about its environment, users, or associated data.

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:R/S:U/C:H/I:N/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.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.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.
NetworkUnauthenticatedCWE-209
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-73934Official EUVD mapping

Generation of error message containing sensitive information in Skype for Business allows an unauthorized attacker to disclose information over a network.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3234Microsoft Office Produkte: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in verschiedenen Microsoft Office Produkten, Microsoft Office Online Server, Microsoft 365 Apps, Microsoft SharePoint, Microsoft Teams und Microsoft Skype ausnutzen, um erhöhte Berechtigungen zu erlangen, um Code auszuführen, um Informationen offenzulegen und um den Nutzer zu täuschen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1149Multiples vulnérabilités dans les produits Microsoft

septembre 2026 Bulletin de sécurité Microsoft CVE-2026-58649 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-63523 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-65669 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-65772 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-65812 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66302 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66303 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66304 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66305 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66306 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66307 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66308 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66814 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66816 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66818 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66819 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-66820 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-67368 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-67369 du 08 septembre 2026 Bulletin de sécurité Micr

Official advisory ↗
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-24Aggiornamenti Mensili Microsoft

nuova finestra - - CVE-2026-57098 : apre una nuova finestra - - CVE-2026-68895 : apre una nuova finestra - - CVE-2026-68775 : apre una nuova finestra - - CVE-2026-68896 : apre una nuova finestra - - CVE-2026-68893 : apre una nuova finestra - - CVE-2026-68894 : apre una nuova finestra - - CVE-2026-68778 : apre una nuova finestra - - CVE-2026-68779 : apre una nuova finestra - - CVE-2026-68776 : apre una nuova finestra - - CVE-2026-68897 : apre una nuova finestra - - CVE-2026-68777 : apre una nuova finestra - - CVE-2026-68898 : apre una nuova finestra - - CVE-2026-69265 : apre una nuova finestra - - CVE-2026-69266 : apre una nuova finestra - - CVE-2026-66306 : apre una nuova finestra - - CVE-2026-68848 : apre una nuova finestra - - CVE-2026-66305 : apre una nuova finestra - - CVE-2026-67636 : apre una nuova finestra - - CVE-2026-68849 : apre una nuova finestra - - CVE-2026-66308 : apre una nuova finestra - - CVE-2026-67639 : apre una nuova finestra - - CVE-2026-68846 : apre una nuova finestra - - CVE-2026-66307 : apre una nuova finestra - - CVE-2026-67638 : apre una nuova finestra - - CVE-2026-68847 : apre una nuova finestra - - CVE-2026-56198 : apre una nuova finestra - - CVE-2026-68840 : apre una nuova finestra - - CVE-2026-68841 : apre una nuova finestra - - CVE-2026-67631 : apre una nuova fi

Official advisory ↗
NCSC-NL · Dutch · NCSC-2026-0352Kwetsbaarheden verholpen in Microsoft Office

Een kwaadwillende kan de kwetsbaarheden misbruiken om aanvallen uit te voeren die kunnen leiden tot de categorieën schade, zoals genoemd in onderstaande tabel. Voor succesvol misbruik moet de kwaadwillende het slachtoffer misleiden een malafide bestand te openen of link te volgen. Microsoft heeft voor Office 114 kwetsbaarheden verholpen. De 4 ernstigste kwetsbaarheden bevinden zich in meerdere Office componenten en hebben een CVSS score van 9.8 toegewezen gekregen. Kwaadwillenden met toegang tot deze componenten kunnen zonder voorafgaande authenticatie mogelijk code uitvoeren of zich toegang verschaffen tot het kwetsbare systeem. Deze kwetsbaarheden zijn in onderstaande tabel weergegeven. De overige 110 kwetsbaarheden variëren in ernst van middelmatig tot hoog en kritiek. Raapleeg het MSRC-portaal voor aanvullende informatie. ``` |----------------|------|---------------------------|-------------------------------------| | CVE-ID | CVSS | Component | Impact | |----------------|------|---------------------------|-------------------------------------| | CVE-2026-78505 | 9,80 | Office | Uitvoeren van willekeurige code | |----------------|------|---------------------------|-------------------------------------| | CVE-2026-78509 | 9,80 | Outlook | Uitvoeren van willekeurige code | |----------------|------|---------------------------|-------------------------------------| | CVE-2026-78510 | 9,80 | Outlook | Uitvoeren van willekeurige code | |----------------|------|---------------------------|-------------------------------------| | CVE-2026-66302 | 9,80 | SKYPE | Uitvoeren van willekeurige code | |----------------|------|---------------------------|-------------------------------------| ```

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 8 Sept 2026 · Last source change 11 Sept 2026, 22:09 UTC · CWE-209 · Generation of Error Message Containing Sensitive Information

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 2026-09-09
European sourceENISA EUVD · EUVD-2026-73934
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enrichment underway

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
    9319.0 < 6.0.9319.885; 2046.0 < 7.0.2046.569; 2046.0 < 7.0.2046.879 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    Skype for Business Server 2015 CU13: 9319.0 < 6.0.9319.885; Skype for Business Server 2019 CU8: 2046.0 < 7.0.2046.569; Skype for Business Server Subscription Edition CU1: 2046.0 < 7.0.2046.879 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  2. ENISA EUVD mappingEUVD-2026-73934 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-73934"}
    ENISA EUVD ↗
  3. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-73934↗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-2026-66306 · cve.blacktree.nl