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CVE-2026-66306 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-09-08T19:18:08.200Z and has not been modified since then. This CVE record details a vulnerability in Skype for Business Server that allows an unauthorized attacker to disclose information over a network through error messages containing sensitive information. The affected versions require verification and patching. Defenders responsible for Skype for Business Server deployments, especially those using versions 2015, 2019, and 7.0.2046.849, should assess exposure and prioritize patching. The CVE Program and NVD provide additional context and details on this vulnerability.

Vendor
Microsoft
Product
Skype for Business Server 2015 CU13
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-16
Advisory published
2026-09-08
Advisory updated
2026-09-16

Who should care

Defenders responsible for Skype for Business Server deployments, especially those using versions 2015, 2019, and 7.0.2046.849, should assess exposure and prioritize patching.

Why it matters

Defenders should care about CVE-2026-66306 because it allows an unauthorized attacker to disclose information over a network in Skype for Business Server, impacting confidentiality. Affected versions require verification and patching.

  • Potential information disclosure over the network.
  • Need to verify and apply patches for affected Skype for Business Server versions.
  • Importance of monitoring for potential information disclosure attempts.

Technical summary

A vulnerability in Skype for Business Server allows an unauthorized attacker to disclose information over a network through error messages containing sensitive information. This vulnerability impacts confidentiality and affects Skype for Business Server versions 2015, 2019, and 7.0.2046.849. Defenders should prioritize verifying and applying patches for these versions to mitigate potential information disclosure over the network.

Defensive priority

Defenders should prioritize verifying and applying patches for Skype for Business Server, especially for versions 2015, 2019, and 7.0.2046.849.

Recommended defensive actions

  • Verify and apply patches for Skype for Business Server, especially for versions 2015, 2019, and 7.0.2046.849.
  • Review and update inventory to ensure all instances of Skype for Business Server are accounted for.
  • Monitor for potential information disclosure attempts.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in Skype for Business Server, allowing an unauthorized attacker to disclose information over a network.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-66306 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-66306

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-66306 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-66306

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.