CVE-2026-20830 | BDVDB-2026-310402 Detail

MicrosoftWindows Server 2025

Description#

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

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: local.

Weaknesses#

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416 Use After Free

References#

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

Exploit#

No public exploit known

History#

Version 12026-01-13Record published in the CVE List.
Version 22026-07-30Most recent update recorded in the CVE List.

Published

Published: 2026-01-13
Last modified: 2026-07-30

Vendor information

Vendor: Microsoft
Product: Windows Server 2025

All Microsoft vulnerabilities

Score

7.0 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 21.8.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Race Condition

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 10.0.26100.0 and < 10.0.26100.32230
Fixed
10.0.26100.32230

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.0 High

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

Metric breakdown
Attack Vector	Local
Attack Complexity	High
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).