{"cve":"CVE-2026-28449","nvd":{"published":"2026-03-19T02:16:02.390","modified":"2026-06-17T10:28:39.633","status":"Modified","description":"OpenClaw versions prior to 2026.2.25 lack durable replay state for Nextcloud Talk webhook events, allowing valid signed webhook requests to be replayed without suppression. Attackers can capture and replay previously valid signed webhook requests to trigger duplicate inbound message processing and cause integrity or availability issues.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","score":6.5},"cwes":["CWE-294"],"references":["https://github.com/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f493dbbc","https://github.com/openclaw/openclaw/security/advisories/GHSA-r9q5-c7qc-p26w","https://www.vulncheck.com/advisories/openclaw-webhook-replay-attack-via-missing-durable-replay-suppression"],"products":["openclaw:openclaw"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-28449","score":0.00277,"percentile":0.20201,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-r9q5-c7qc-p26w","url":"https://osv.dev/vulnerability/GHSA-r9q5-c7qc-p26w","summary":"OpenClaw's Nextcloud Talk webhook replay could trigger duplicate inbound processing","modified":"2026-03-19T21:41:20.740600Z","packages":[{"ecosystem":"npm","name":"openclaw","purl":"pkg:npm/openclaw","ranges":["<2026.2.25"],"fixed":["2026.2.25"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}