7.8

CVE-2026-87692: microsoft microsoft exchange server 2016 cumulative update 23 Deserialization of Untrusted Data

CVSS: 7.8v3.1HighAwaiting analysis
Published 13-10-2026Last modified 20-10-2026
Open JSON

Vulnerability summary

CVE-2026-87692 is a high (CVSS 7.8) Deserialization of Untrusted Data vulnerability in microsoft microsoft exchange server 2016 cumulative update 23. EPSS estimates a 1.59% chance of exploitation in the next 30 days, higher than 75.2% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
1.59%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-10-2026
    PublishedVulnerability first disclosed.
  2. 20-10-2026
    Last modifiedVulnerability information updated.

Description

Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

1.59%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

14-10-202620-10-2026
EPSS score
1.59%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft3 products

1 vendor · 3 products

References

1 links