Vulnerability · Published Mar 19, 2026 · Assigned by VulnCheck

CVE-2026-28449OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression

Medium 6.5

In plain English

A medium-severity security flaw in OpenClaw from OpenClaw. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 79.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	openclaw	2026.2.25	GHSA-r9q5-c7qc-p26w

Affected products (as reported)

Vendor	Product	Versions
OpenClaw	OpenClaw	0 – before 2026.2.25

Weakness: CWE-294 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

References

GitHub Security Advisory (GHSA-r9q5-c7qc-p26w) vendor-advisory
Patch Commit patch
VulnCheck Advisory: OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression third-party-advisory