GHSA-9528-x887-j2fp
OpenClaw's Nextcloud Talk webhook missing rate limiting on shared secret authentication
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
## 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.
References
External links from the advisory. They lead to third-party sites.
- https://github.com/openclaw/openclaw/security/advisories/GHSA-9528-x887-j2fp
- https://nvd.nist.gov/vuln/detail/CVE-2026-33580
- https://github.com/openclaw/openclaw/commit/e403decb6e20091b5402780a7ccd2085f98aa3cd
- https://github.com/openclaw/openclaw
- https://github.com/openclaw/openclaw/releases/tag/v2026.3.28
- https://www.vulncheck.com/advisories/openclaw-brute-force-attack-via-missing-rate-limiting-on-webhook-shared-secret-authentication