Auth bypass in Openclaw
CVE-2026-34506
OpenClaw before 2026.3.8 contains a sender allowlist bypass vulnerability in its Microsoft Teams plugin that allows unauthorized senders to bypass intended authorization checks. When a team/channel route allowlist is configured with an empty groupAllowFrom parameter, the message handler synthesizes wildcard sender authorization, permitting any sender in the matched team/channel to trigger replies in allowlisted Teams routes.
Vulnerability class: Broken Access Control
EPSS: 0.003 (18.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Openclaw — versions 0, 2026.3.8
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory, Vendor Advisory, third-party-advisory)
- disclosure@vulncheck.com (Patch, patch)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-34506?
- CVE-2026-34506 is a medium-severity vulnerability in Openclaw, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-03-31.
- How severe is CVE-2026-34506?
- Medium severity. CVSS v3 base score is 4.3 out of 10.