OpenClaw before 2026.3.25 contains a missing rate limiting vulnerability in Telegram webhook authentication that allows attackers to brute-force weak webhook secrets.
Date: 2026-04
Affected: openclaw/openclaw
Attack vector: other
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-35628
CWE: CWE-307
CVSS: 4.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)

OpenClaw before 2026.3.25 contains a missing rate limiting vulnerability in Telegram webhook authentication that allows attackers to brute-force weak webhook secrets. The vulnerability enables repeated authentication guesses without throttling, permitting attackers to systematically guess webhook secrets through brute-force attacks.


Mitigations:

Architectural layers (MAESTRO):