CVE-2026-35628 | THREATINT

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.

PUBLISHED Reserved 2026-04-04 | Published 2026-04-09 | Updated 2026-04-13 | Assigner VulnCheck

MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-307 Improper Restriction of Excessive Authentication Attempts

Product status

Default status

unaffected

Any version before 2026.3.25

affected

2026.3.25 (semver)

unaffected

Credits

Peng Zhou (@zpbrent) reporter

References

github.com/...enclaw/security/advisories/GHSA-vcx4-4qxg-mfp4 (GitHub Security Advisory (GHSA-vcx4-4qxg-mfp4)) third-party-advisory

github.com/...ommit/c2c136ae9517ddd0789d742a0fdf4c10e8c729a7 (Patch Commit) patch

www.vulncheck.com/...-missing-telegram-webhook-rate-limiting (VulnCheck Advisory: OpenClaw < 2026.3.25 - Brute-Force Attack via Missing Telegram Webhook Rate Limiting) third-party-advisory

cve.org (CVE-2026-35628)

nvd.nist.gov (CVE-2026-35628)

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