Vulnerability · Published Apr 9, 2026 · Assigned by VulnCheck
CVE-2026-35628OpenClaw < 2026.3.25 - Brute-Force Attack via Missing Telegram Webhook Rate Limiting
Medium 4.8
In plain English
A medium-severity security flaw in OpenClaw from OpenClaw. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Severity (CVSS 3.1)4.8Medium
Exploit odds (30 days)0.3%top 77.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | openclaw | no fix listed | GHSA-vcx4-4qxg-mfp4 |
Affected products (as reported)
Weakness: CWE-307 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- GitHub Security Advisory (GHSA-vcx4-4qxg-mfp4) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: OpenClaw < 2026.3.25 - Brute-Force Attack via Missing Telegram Webhook Rate Limiting third-party-advisory