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Description

OpenClaw before 2026.3.28 contains a privilege escalation vulnerability in the chat.send endpoint that allows write-scoped gateway callers to persist admin-only verboseLevel session overrides. Attackers can exploit the /verbose parameter to bypass access controls and expose sensitive reasoning or tool output intended to be restricted to administrators.

PUBLISHED Reserved 2026-04-20 | Published 2026-04-23 | Updated 2026-04-24 | Assigner VulnCheck




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

Default status
unaffected

Any version before 2026.3.28
affected

2026.3.28 (semver)
unaffected

Credits

Peng Zhou (@zpbrent) reporter

References

github.com/...enclaw/security/advisories/GHSA-5h2w-qmfp-ggp6 (GitHub Security Advisory (GHSA-5h2w-qmfp-ggp6)) vendor-advisory

www.vulncheck.com/...alation-via-chat-send-verbose-parameter (VulnCheck Advisory: OpenClaw < 2026.3.28 - Privilege Escalation via chat.send /verbose Parameter) third-party-advisory

cve.org (CVE-2026-41344)

nvd.nist.gov (CVE-2026-41344)

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