CVE-2026-100541 OpenClaw Matrix before 2026.8.1 Authorization Bypass via Case Folding
Attackers can bypass authorization checks by exploiting case-folding flaws in user ID normalization, inheriting privileged permissions from other accounts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100541?
CVE-2026-100541 is a high-severity authentication bypass vulnerability in openclaw matrix, published on 26 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OpenClaw's Matrix integration (npm package @openclaw/matrix) versions >= 2026.2.2 and < 2026.8.1 lowercase complete Matrix user IDs — including historical localparts and the case-sensitive server-name portion — when deriving the OpenClaw authorization identity. As a result, distinct authenticated Matrix accounts can normalize to the same authorization identity. A Matrix participant controlling a colliding account identifier (a protocol-valid identifier that differs from the configured one only by characters OpenClaw case/Unicode folds; display-name matching is not required) can inherit allowlist, owner-command, exec-approval, or plugin-approval authority configured for another account. The issue is fixed in 2026.8.1.
Weakness: CWE-178
Which versions are affected by CVE-2026-100541?
How do I fix CVE-2026-100541?
No fix has been published for CVE-2026-100541 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-100541 being exploited?
There is no known exploitation of CVE-2026-100541 in the wild and no public exploit code.
Sources
Also known as GHSA-4793-q4pp-q755, GHSA-hgv5-f2r3-6v9r.