What is CVE-2026-35628?

CVE-2026-35628 is a medium-severity vulnerability in Openclaw, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 4.8/10. Published 2026-04-09.

How severe is CVE-2026-35628?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Openclaw

CVE-2026-35628

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 thrott…

EPSS: 0.001 (21.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Openclaw — versions 0, 2026.3.25

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

GitHub Security Advisory (GHSA-vcx4-4qxg-mfp4) (third-party-advisory)
Patch Commit (patch)
VulnCheck Advisory: OpenClaw < 2026.3.25 - Brute-Force Attack via Missing Telegram Webhook Rate Limiting (third-party-advisory)

Frequently asked questions

What is CVE-2026-35628?: CVE-2026-35628 is a medium-severity vulnerability in Openclaw, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 4.8/10. Published 2026-04-09.
How severe is CVE-2026-35628?: Medium severity. CVSS v3 base score is 4.8 out of 10.