Improper Restriction of Excessive Authentication Attempts in OpenClaw - CVE-2026-33580
Published: April 8, 2026
Vulnerability identifier: #VU125225
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33580
CWE-ID: CWE-307
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenClaw
Affected software:
OpenClaw
OpenClaw
Detailed vulnerability description
The vulnerability allows a remote attacker to forge inbound webhook events.
The vulnerability exists due to improper restriction of excessive authentication attempts in extensions/nextcloud-talk/src/monitor.ts when handling webhook signature authentication. A remote attacker can brute-force a weak shared secret online to forge inbound webhook events.
The issue is exposed to an attacker who can reach the webhook endpoint.
How to mitigate CVE-2026-33580
Install security update from vendor's website.