What is CVE-2026-100540?

CVE-2026-100540 is a medium-severity vulnerability in Openclaw Feishu, classified under Incorrect Authorization. CVSS score: 6.8/10. Published 2026-09-26.

How severe is CVE-2026-100540?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Openclaw Feishu

CVE-2026-100540

OpenClaw Feishu before 2026.8.1 fails to validate whether a configured default account is disabled before selecting it for model tool operations. Attackers can exploit multi-account setups where a disabled default account retains credentials to read or modify Feishu resources through a revoked identity.

Vulnerability class: Broken Access Control

Published 2026-09-26.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Openclaw Feishu

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

github.com/openclaw/openclaw/security/advisories/GHSA-h2qg-fxpv-82v6 (vendor-advisory)
www.vulncheck.com/advisories/openclaw-feishu-before-2026.8.1-authentication-byp… (third-party-advisory)

Frequently asked questions

What is CVE-2026-100540?: CVE-2026-100540 is a medium-severity vulnerability in Openclaw Feishu, classified under Incorrect Authorization. CVSS score: 6.8/10. Published 2026-09-26.
How severe is CVE-2026-100540?: Medium severity. CVSS v3 base score is 6.8 out of 10.