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PatchSiren cyber security CVE debrief

CVE-2026-66308 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-09-08T19:18:08.450Z and has not been modified since then. This medium-severity vulnerability in Skype for Business Server could allow an authorized attacker to deny service over a network. Defenders should assess exposure and prioritize remediation, particularly for versions 2015, 2019, and 7.0.2046.849. The vulnerability is an out-of-bounds read issue. Verification and application of patches are crucial.

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, particularly those using versions 2015, 2019, and 7.0.2046.849, should assess exposure and prioritize remediation.

Why it matters

CVE-2026-66308 is a medium-severity vulnerability in Skype for Business Server that could allow an authorized attacker to deny service over a network. Defenders should prioritize verifying and applying patches, reviewing inventory, and monitoring for potential service denial attempts.

  • Potential service denial over the network.
  • Need to verify and apply patches for affected versions.
  • Importance of reviewing and updating inventory to ensure affected versions are identified.

Technical summary

The CVE record and NVD entry describe an out-of-bounds read vulnerability in Skype for Business Server, which could allow an authorized attacker to deny service over a network. The vulnerability affects versions 2015, 2019, and 7.0.2046.849. Defenders should prioritize verifying and applying patches for these versions. The issue is an out-of-bounds read vulnerability that could lead to service denial.

Defensive priority

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

Recommended defensive actions

  • Verify and apply patches for Skype for Business Server, particularly for versions 2015, 2019, and 7.0.2046.849.
  • Review and update inventory to ensure affected versions are identified and prioritized for remediation.
  • Monitor for potential service denial attempts over the network.

Evidence notes

The CVE record and NVD entry provide details on an out-of-bounds read vulnerability in Skype for Business Server, which could allow an authorized attacker to deny service over a network.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-66308 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-66308

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

  • CVE-2026-66308 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-66308

    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.