Authentication Bypass by Spoofing in OpenClaw - CVE-2026-28480
Published: May 4, 2026
Vulnerability identifier: #VU129465
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-28480
CWE-ID: CWE-290
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenClaw
Affected software:
OpenClaw
OpenClaw
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authorization checks.
The vulnerability exists due to authentication bypass by spoofing in the Telegram allowlist authorization mechanism when matching allowlist entries against mutable @username values instead of immutable numeric sender IDs. A remote attacker can use a recycled or reassigned Telegram username to bypass authorization checks.
This issue affects deployments that rely on Telegram allowlists as strict identity controls.
How to mitigate CVE-2026-28480
Install security update from vendor's website.