{"id":"GHSA-r9q5-c7qc-p26w","summary":"OpenClaw's Nextcloud Talk webhook replay could trigger duplicate inbound processing","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: `\u003c= 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.","aliases":["CVE-2026-28449"],"modified":"2026-03-19T21:41:20.740600Z","published":"2026-03-03T23:08:55Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-03-03T23:08:55Z","nvd_published_at":null,"cwe_ids":["CWE-294"],"severity":"MODERATE"},"references":[{"type":"WEB","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":"WEB","url":"https://github.com/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f493dbbc"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/openclaw-webhook-replay-attack-via-missing-durable-replay-suppression"}],"affected":[{"package":{"name":"openclaw","ecosystem":"npm","purl":"pkg:npm/openclaw"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2026.2.25"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 2026.2.24","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-r9q5-c7qc-p26w/GHSA-r9q5-c7qc-p26w.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}