GHSA-9528-x887-j2fp — medium GitHub Advisory (CVE-2026-33580) in npm/openclaw

Description

Summary

Nextcloud Talk webhook signature failures were not throttled even though the integration relies on an operator-configured shared secret that may be weak.

Impact

An attacker who could reach the webhook endpoint could brute-force weak secrets online and then forge inbound webhook events.

Affected Component

extensions/nextcloud-talk/src/monitor.ts

Fixed Versions

Affected: <= 2026.3.24
Patched: >= 2026.3.28
Latest stable 2026.3.28 contains the fix.

Fix

Fixed by commit e403decb6e (nextcloud-talk: throttle repeated webhook auth failures).

OpenClaw thanks @AntAISecurityLab for reporting.

Basic information

Type: reviewed
Severity: medium
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2026-03-31 23:59:17 UTC
Updated: 2026-04-06 22:53:26 UTC
GitHub reviewed: 2026-03-31 23:59:17 UTC

Score	Percentile
0.08%	22.67%

CVSS Scores

No CVSS scores in this advisory.

Identifiers

Type	Value
GHSA	GHSA-9528-x887-j2fp ↗
CVE	CVE-2026-33580 ↗

CWEs

CWE id	Name
CWE-307	Improper Restriction of Excessive Authentication Attempts

Credits

AntAISecurityLab (reporter)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
npm	openclaw	<= 2026.3.24	2026.3.28	—

OpenClaw's Nextcloud Talk webhook missing rate limiting on shared secret authentication