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PatchSiren cyber security CVE debrief

CVE-2026-63523 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-09-08T19:18:07.267Z and has not been modified since then. This CVE-2026-63523 is a cross-site scripting vulnerability in Skype for Business Server 2015 CU13 that allows an unauthorized attacker to perform spoofing over a network. Defenders should assess exposure and prioritize verifying exposure of Skype for Business Server 2015 CU13 and assessing the impact of potential spoofing attacks.

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
2026-10-14
Advisory published
2026-09-08
Advisory updated
2026-10-14

Who should care

Defenders responsible for Skype for Business Server 2015 CU13 deployments should assess exposure and potential impact. They should verify exposure of Skype for Business Server 2015 CU13 and assess the impact of potential spoofing attacks. Defenders need to prioritize verifying exposure and assessing potential impact of spoofing attacks.

Why it matters

CVE-2026-63523 is a medium-severity cross-site scripting vulnerability in Skype for Business Server 2015 CU13 that allows an unauthorized attacker to perform spoofing over a network. Defenders responsible for Skype for Business Server 2015 CU13 deployments should assess exposure and potential impact, and prioritize verifying exposure and assessing the impact of potential spoofing attacks.

  • Potential spoofing attacks over the network
  • Defenders need to verify exposure of Skype for Business Server 2015 CU13
  • Defenders need to assess the impact of potential spoofing attacks

Technical summary

CVE-2026-63523 is a cross-site scripting vulnerability in Skype for Business Server 2015 CU13 that allows an unauthorized attacker to perform spoofing over a network. The vulnerability affects Skype for Business Server 2015 CU13 and allows attackers to perform spoofing attacks. Defenders should prioritize verifying exposure and assessing potential impact of spoofing attacks.

Defensive priority

Defenders should prioritize verifying exposure of Skype for Business Server 2015 CU13 and assessing the impact of potential spoofing attacks.

Recommended defensive actions

  • Verify exposure of Skype for Business Server 2015 CU13
  • Assess the impact of potential spoofing attacks
  • Review and update defensive measures to prevent similar attacks

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability, with the NVD entry currently undergoing analysis. Evidence is limited to CVE and NVD entries. Defenders should verify exposure based on available information and assess potential impact of spoofing attacks. Supplied CVE and NVD information indicates a medium-severity vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-63523 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-63523

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

  • CVE-2026-63523 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-63523

    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.