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Description

OpenClaw before 2026.4.24 contains an authorization bypass vulnerability in the MCP loopback feature that allows non-owner callers to skip owner-only tool policies and before-tool-call hooks. Attackers can invoke owner-only behavior through the affected loopback path to execute restricted tools when the feature is enabled and reachable.

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




MEDIUM: 6.9CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

MEDIUM: 6.6CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

Problem types

Missing Authorization

Product status

Default status
unaffected

Any version before 2026.4.24
affected

2026.4.24 (semver)
unaffected

Credits

zsx (@zsxsoft) reporter

KeenSecurityLab coordinator

qclawer finder

qclawer tool

References

github.com/...enclaw/security/advisories/GHSA-rj6p-xmxr-qj4h (GitHub Security Advisory (GHSA-rj6p-xmxr-qj4h)) vendor-advisory patch

www.vulncheck.com/...nly-tool-policy-bypass-via-mcp-loopback third-party-advisory

cve.org (CVE-2026-53818)

nvd.nist.gov (CVE-2026-53818)

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