{"id":"CVE-2026-28449","aliases":["GHSA-r9q5-c7qc-p26w"],"url":"https://o3.security/vulnerability/CVE-2026-28449","summary":"OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression","details":"### Summary\nWhen 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.\n\n### Details\nOpenClaw'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.\n\nThe fix on `main` adds:\n- persistent per-account replay dedupe for Nextcloud Talk webhook events,\n- replay checks before webhook side effects (`onMessage`),\n- backend-origin validation against configured account base URL (when configured).\n\n### Impact\nA 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.\n\n### Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Affected: `<= 2026.2.24`\n- Patched in release: `2026.2.25`\n\n### Fix Commit(s)\n- `d512163d686ad6741783e7119ddb3437f493dbbc`\n\n### Release Process Note\n`patched_versions` is pre-set to the release (`2026.2.25`) so once npm release `2026.2.25` is published, advisory is now published.\n\nOpenClaw thanks @aristorechina for reporting.","published":"2026-03-19T01:00:45.387Z","modified":"2026-10-28T02:31:04.996574010Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"openclaw","fixedVersion":"2026.2.25"}],"fix":{"url":"https://github.com/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f493dbbc","label":"openclaw/openclaw@d512163"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28449.json"},{"type":"ADVISORY","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-r9q5-c7qc-p26w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28449"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openclaw-webhook-replay-attack-via-missing-durable-replay-suppression"},{"type":"FIX","url":"https://github.com/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f493dbbc"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:31:04.996574010Z"}}