AI agent vulnerability · OpenClaw

CVE-2026-33580: OpenClaw's Nextcloud Talk webhook missing rate limiting on shared secret authentication

mediumGHSA-9528-x887-j2fp

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.

Published Mar 31, 2026 · Updated Apr 6, 2026

Affected packages

openclaw

Ecosystem: npm
Affected: <= 2026.3.24
Fixed in: 2026.3.28
Check: npm ls openclaw

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

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.

Credited to AntAISecurityLab.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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