CVE-2026-87696CWE-347

CVE-2026-87696

High · published October 13, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
30.6
In the wild
Unconfirmed
What it is

Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00378 · 30.6th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-10-13T23:21Z
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87696 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:35Z
    EPSS moved — → 0%
    epss
  • 13 OCT 19:01Z
    Microsoft Exchange Server Elevation of Privilege Vulnerability
    cvelistv5
  • 13 OCT 19:01Z
    Microsoft Exchange Server Elevation of Privilege Vulnerability
    cvelistv5