PT-2026-31764 · Openclaw · Openclaw

Peng Zhou · Published 2026-03-27 · Updated 2026-04-10 · CVE-2026-35628

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions OpenClaw versions prior to 2026.3.25

Description OpenClaw contains a missing rate limiting issue in Telegram webhook authentication. This allows attackers to brute-force weak webhook secrets by repeatedly guessing without throttling. The vulnerability enables systematic guessing of webhook secrets through brute-force attacks.

Recommendations Update to version 2026.3.25 or later.

Fix

Improper Restriction of Excessive Authentication Attempts

Weakness Enumeration

CWE-521

CWE-307

Related Identifiers

CVE-2026-35628

GHSA-R4C2-GQ3J-7RPJ

GHSA-VCX4-4QXG-MFP4

Affected Products

Openclaw

References · 10

• https://github.com/openclaw/openclaw/commit/c2c136ae9517ddd0789d742a0fdf4c10e8c729a7 · Patch
• https://github.com/openclaw/openclaw/security/advisories/GHSA-vcx4-4qxg-mfp4 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-vcx4-4qxg-mfp4 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35628 · Security Note
• https://osv.dev/vulnerability/GHSA-r4c2-gq3j-7rpj · Vendor Advisory
• https://github.com/openclaw/openclaw · Note
• https://vulncheck.com/advisories/openclaw-brute-force-attack-via-missing-telegram-webhook-rate-limiting · Note
• https://twitter.com/infoflowcloud/status/2042390049279402190 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2042479849575514317 · Twitter Post
• https://twitter.com/CVEnew/status/2042387952647750081 · Twitter Post