PT-2026-31365 · Npm · Openclaw

Published 2026-03-29 · Updated 2026-03-29

OSV

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Summary

Synology Chat Webhook Pre-Auth Rate-Limit Bypass Enables Brute-Force Guessing of Weak Webhook Token

Affected Packages / Versions

• Package: openclaw
• Affected versions: <= 2026.3.24
• First patched version: 2026.3.25
• Latest published npm version at verification time: 2026.3.24

Details

Synology Chat webhook auth previously rejected invalid tokens without throttling repeated guesses, allowing brute-force attempts against weak webhook secrets. Commit 0b4d07337467f4d40a0cc1ced83d45ceaec0863c adds repeated-guess throttling before auth failure responses.

Verified vulnerable on tag v2026.3.24 and fixed on main by commit 0b4d07337467f4d40a0cc1ced83d45ceaec0863c.

Fix Commit(s)

• 0b4d07337467f4d40a0cc1ced83d45ceaec0863c

Fix

Improper Restriction of Excessive Authentication Attempts

Weakness Enumeration

CWE-521

CWE-307

Related Identifiers

GHSA-MF5G-6R6F-GHHM

Affected Products

Openclaw

References · 6

• https://osv.dev/vulnerability/GHSA-mf5g-6r6f-ghhm · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35646 · Security Note
• https://github.com/openclaw/openclaw · Note
• https://github.com/openclaw/openclaw/security/advisories/GHSA-mf5g-6r6f-ghhm · Note
• https://github.com/openclaw/openclaw/commit/0b4d07337467f4d40a0cc1ced83d45ceaec0863c · Note
• https://vulncheck.com/advisories/openclaw-pre-authentication-rate-limit-bypass-in-webhook-token-validation · Note