Vulnerability · CVE-2026-62911
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Published Aug 11, 2026 · catalog updated Oct 14, 2026 · exchange server
Check if you run it
No confirmed exploitation is on record for CVE-2026-62911. EPSS is 0.69%. Act only if a listed version of exchange server is installed.
Gaps on this record
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High8.0
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.69%
- Remediation
- Advisory link
- Affected products
- cpe microsoft/exchange server
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe microsoft/exchange server2016
How to fix CVE-2026-62911
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-62911. EPSS is 0.69%. Act only if a listed version of exchange server is installed.
Which versions are affected?
Compare what you have installed with microsoft/exchange server 2016. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-294. EPSS 0.69%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Aug 11, 2026 · NIST NVD
Detected
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Oct 14, 2026 · NIST NVD
Updated
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Sources
- CVE.orgVulnerability recordCVE-2026-62911
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-62911
30-day exploitation probability 0.7%
first.org - NIST NVDVulnerability recordCVE-2026-62911
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.