Capability Access Management Service (camsvc) Elevation of Privilege Vulnerability

published 2026-01-13 9 mo ago modified 2026-07-30 3 mo ago also EUVD-2026-2207

cvss: 7.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits: 0; none known

Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.

Patch / fix

fixed in 2 links 1

Microsoft Windows Server 2025 10.0.26100.32230
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.32230

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20830 advisory

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 9 mo ago (2026-01-14)

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.0	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA	3.1	7.0	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows Server 2025
Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
CWE-416 Use After Free

References

msrc.microsoft.com /update-guide/vulnerability/CVE-2026-20830
vendor-advisory, patch

Sources

CVE List CVE-2026-20830
NVD CVE-2026-20830

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary