CVE-2026-28449
OpenClaw's Nextcloud Talk webhook replay could trigger duplicate inbound processing
Description
### 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.
How to fix CVE-2026-28449
To remediate CVE-2026-28449, upgrade the affected package to a fixed version below.
- —upgrade to 2026.2.25 or later
Is CVE-2026-28449 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 2026.2.25
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |