{"id":"CVE-2026-35603","aliases":["GHSA-5cwg-9f6j-9jvx"],"url":"https://o3.security/vulnerability/CVE-2026-35603","summary":"Claude Code: Insecure System-Wide Configuration Loading Enables Local Privilege Escalation on Windows","details":"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.\n\nUsers on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.\n\nThank you to hackerone.com/edbr for reporting this issue.","published":"2026-04-17T20:38:49.901Z","modified":"2026-08-12T03:51:19.149916181Z","cvss":null,"epss":{"score":0.00108,"percentile":0.01335,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@anthropic-ai/claude-code","fixedVersion":"2.1.75"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35603.json"},{"type":"ADVISORY","url":"https://github.com/anthropics/claude-code/security/advisories/GHSA-5cwg-9f6j-9jvx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35603"},{"type":"PACKAGE","url":"https://github.com/anthropics/claude-code"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:19.149916181Z"}}