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CVE-2026-69375 Microsoft CVE debrief

Microsoft Exchange Server vulnerability allows authorized attackers to perform tampering over a network. Defenders should assess exposure, prioritize remediation, and verify affected versions. The vulnerability has a CVSS score of 6.5 and is classified as CWE-639. Microsoft has provided guidance on affected versions and mitigation strategies. Defenders should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Vendor
Microsoft
Product
Microsoft Exchange Server 2016 Cumulative Update 23
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-11
Advisory published
2026-09-08
Advisory updated
2026-09-11

Who should care

Exchange Server administrators and security teams responsible for Microsoft Exchange Server deployments should assess exposure, prioritize remediation, and verify affected versions. They should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance. Defenders should also plan vendor-supported updates or mitigations through normal change control where exposure is

Why it matters

CVE-2026-69375 is a medium-severity vulnerability in Microsoft Exchange Server that allows an authorized attacker to perform tampering over a network. Defenders should assess exposure, prioritize remediation, and verify affected versions.

  • Verify affected Exchange Server versions and configurations
  • Assess exposure to tampering attacks
  • Prioritize remediation based on CVSS score and vendor guidance

Technical summary

CVE-2026-69375 is a medium-severity vulnerability in Microsoft Exchange Server that allows an authorized attacker to perform tampering over a network. The vulnerability has a CVSS score of 6.5 and is classified as CWE-639. Defenders should assess exposure, prioritize remediation, and verify affected versions. Microsoft has provided guidance on affected versions and mitigation strategies.

Defensive priority

Medium priority for Exchange Server administrators to verify and remediate

Recommended defensive actions

  • Verify Exchange Server versions and configurations
  • Assess exposure to tampering attacks
  • Prioritize remediation based on CVSS score and vendor guidance

Evidence notes

Limited evidence from official CVE and NVD records; Microsoft reference available. The CVE record was published on 2026-09-08T18:18:58.057Z and has not been modified since then. Defenders should verify affected Exchange Server versions and configurations, assess exposure to tampering attacks, and prioritize remediation based on CVSS score and vendor guidance. The official CVE Program record and NIST NVD detail page provide source-provided CVE metadata and source-specific vulnerability

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69375 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69375

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

  • CVE-2026-69375 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69375

    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.