OpenClaw's Nextcloud Talk webhook replay could trigger duplicate inbound processing
Summary
When Nextcloud Talk webhook signing was valid, replayed requests could be accepted without durable replay suppression, allowing duplicate inbound processing after replay-window expiry or process restart.
Details
OpenClaw's Nextcloud Talk webhook path verified HMAC(secret, random + body) but previously lacked durable replay state tied to webhook events. This allowed replay of a previously valid signed request in some operational conditions.
The fix on main adds:
- persistent per-account replay dedupe for Nextcloud Talk webhook events,
- replay checks before webhook side effects (
onMessage), - backend-origin validation against configured account base URL (when configured).
Impact
A captured valid signed webhook request could be replayed to trigger duplicate inbound handling. This is an integrity/availability issue (duplicate actions/noise), scoped to deployments using Nextcloud Talk webhook integration.
Affected Packages / Versions
- Package:
openclaw(npm) - Affected:
<= 2026.2.24 - Patched in release:
2026.2.25
Fix Commit(s)
d512163d686ad6741783e7119ddb3437f493dbbc
Release Process Note
patched_versions is pre-set to the release (2026.2.25) so once npm release 2026.2.25 is published, advisory is now published.
OpenClaw thanks @aristorechina for reporting.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | openclaw | < 2026.2.25 | 2026.2.25 |
References
- https://github.com/openclaw/openclaw/security/advisories/GHSA-r9q5-c7qc-p26w
- https://nvd.nist.gov/vuln/detail/CVE-2026-28449
- https://github.com/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f493dbbc
- https://github.com/openclaw/openclaw
- https://www.vulncheck.com/advisories/openclaw-webhook-replay-attack-via-missing-durable-replay-suppression
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-294- Platform
- npm
- Package
openclaw- Disclosed
- 03.03.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-r9q5-c7qc-p26w - CC BY 4.0
Vulnerability history: openclaw
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 588
- First → latest
- 02.2026 07.2026
- Without a fix
- 9
- Exploited in attacks
- 0
Severity breakdown
- Critical 20
- High 215
- Medium 299
- Low 54
Disclosures per year
- 2026: 588
-
OpenClaw's Nextcloud Talk webhook replay could trigger duplicate inbound processing this entry
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