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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.

PUBLISHED Reserved 2026-02-27 | Published 2026-03-19 | Updated 2026-04-29 | Assigner VulnCheck




MEDIUM: 6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Problem types

CWE-294 Authentication Bypass by Capture-replay

Product status

Default status
unaffected

Any version before 2026.2.25
affected

Credits

Aristore (@aristorechina) reporter

References

github.com/...enclaw/security/advisories/GHSA-r9q5-c7qc-p26w (GitHub Security Advisory (GHSA-r9q5-c7qc-p26w)) third-party-advisory

github.com/...ommit/d512163d686ad6741783e7119ddb3437f493dbbc (Patch Commit) patch

www.vulncheck.com/...-via-missing-durable-replay-suppression (VulnCheck Advisory: OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression) third-party-advisory

cve.org (CVE-2026-28449)

nvd.nist.gov (CVE-2026-28449)

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