Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Timeline

Detection, updates, and resolution for this record.

1. Oct 2, 2026 · NIST NVD

   Detected

   Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

2. Oct 15, 2026 · NIST NVD

   Updated

   Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Affected

• cpe microsoft/exchange server2016
• cpe microsoft/exchange server2019
• cpe microsoft/exchange server subscription editionversion unspecified

Sources

• CVE.orgCVE-2026-96940

  Official CVE identifier

  cve.org
• FIRST EPSSCVE-2026-96940

  30-day exploitation probability 0.5%

  first.org
• NIST NVDCVE-2026-96940

  Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

  nvd.nist.gov

References

• Patch · msrc.microsoft.com