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CVE

CVE-2026-35603

Claude Code: Insecure System-Wide Configuration Loading Enables Local Privilege Escalation on Windows
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CVE

CVE-2026-35603

Claude Code: Insecure System-Wide Configuration Loading Enables Local Privilege Escalation on Windows

On Windows, Claude Code loaded system-wide default configuration from C:\ProgramData\ClaudeCode\managed-settings.json without validating directory ownership or access permissions. Because the ProgramData directory is writable by non-administrative users by default and the ClaudeCode subdirectory was not pre-created or access-restricted, a low-privileged local user could create this directory and place a malicious configuration file that would be automatically loaded for any user launching Claude Code on the same machine. Exploiting this would have required a shared multi-user Windows system and a victim user to launch Claude Code after the malicious configuration was placed.

Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.

Thank you to hackerone.com/edbr for reporting this issue.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
5.4
-
4.0
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
C
H
U
7.3
-
3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/anthropics/claude-code/security/advisories/GHSA-5cwg-9f6j-9jvx, https://nvd.nist.gov/vuln/detail/CVE-2026-35603, https://github.com/anthropics/claude-code

Severity

7.3

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.3
EPSS Probability
0.00012%
EPSS Percentile
0.01946%
Introduced Version
0,0.2.9
Fix Available
2.1.75

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