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Description

OpenClaw before 2026.5.20 contains a privilege escalation vulnerability where hook-triggered agent runs incorrectly receive owner-scoped MCP loopback authority instead of hook-appropriate scope. Attackers with a valid hook token can exploit the /hooks/agent endpoint to cause spawned CLI runtimes to access or invoke owner-only MCP tools, potentially executing privileged actions like persistent cron state modifications.

PUBLISHED Reserved 2026-06-10 | Published 2026-06-11 | Updated 2026-06-13 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

HIGH: 8.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Problem types

Incorrect Privilege Assignment

Product status

Default status
unaffected

Any version before 2026.5.20
affected

2026.5.20 (semver)
unaffected

Credits

cantinagen reporter

Ellahi (@Ellahinator) finder

References

github.com/...enclaw/security/advisories/GHSA-6fvr-66p3-3qj4 (GitHub Security Advisory (GHSA-6fvr-66p3-3qj4)) vendor-advisory patch

www.vulncheck.com/...a-hook-triggered-cli-mcp-tool-authority third-party-advisory

cve.org (CVE-2026-53814)

nvd.nist.gov (CVE-2026-53814)

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