OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression | Advisories

Advisories

OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression

severity: medium
date: 3/18/2026
Affecting: OpenClaw < 2026.2.25
CVE: CVE-2026-28449
CWE: CWE-294 Authentication Bypass by Capture-replay
CVSS: 6.3
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
References: GitHub Security Advisory (GHSA-r9q5-c7qc-p26w)
Patch Commit
Credit: Aristore (@aristorechina)
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.

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