Auth bypass in Openclaw
CVE-2026-100550
OpenClaw (npm package 'openclaw') before 2026.8.1 contains an access-control bypass in the Microsoft Teams integration. When groupPolicy is set to allowlist, a missing or unsupported configured access group produces a denied group-resolution result that is not rejected by the final message-admission check, so a Teams member who is not on the allowlist can still trigger the configured agent despite the administrator's group boundary. The impact depends on the conversations, tools, and data available to that agent. The issue is fixed in version 2026.8.1.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (8.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-8938-r7c6-54vq) (vendor-advisory)
- VulnCheck Advisory: OpenClaw before 2026.8.1 Authentication Bypass via Access Group (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100550?
- CVE-2026-100550 is a medium-severity vulnerability in Openclaw, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-09-26.
- How severe is CVE-2026-100550?
- Medium severity. CVSS v3 base score is 5.4 out of 10.