CVE-2026-87696

HIGH
MEDIUM Priority: 0.03 BB Relevance: 55/100
Published: 2026-10-13 Modified: 2026-10-29 First seen: 2026-10-29 Status: active

Attack Surface

Network No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: High
PR: Low
UI: None
S: Unchanged
C: High
I: High
A: High

Description

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

Weakness Classification (1)

References & Advisories (1)

Bug Bounty Relevance

55 / 100
✓ Network accessible
✓ No user interaction

CVSS Score

7.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

EPSS — Exploitation Probability

0.42%
Raw Score 0.004200
Percentile 36.2%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00420
2026-10-28
0.00420

Intelligence Sources

mitre ref →
nvd ref →