VulnerabilityModified

CVE-2026-62911

Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

HIGH 8.0EPSS 1.32%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.32%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

CVSS 3.1: 8.0 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS: 1.32% probability · 69th percentile
CISA KEV: Not listed
Weakness: CWE-294
Affected: microsoft/exchange server · microsoft/exchange server subscription edition
Source: secure@microsoft.com

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62911Patch, Vendor Advisory
https://github.com/hypnguyen1209/CVE-2026-62911

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.