Authentication Bypass by Capture-replay in OpenClaw - CVE-2026-28449
Published: April 7, 2026
Vulnerability identifier: #VU125084
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-28449
CWE-ID: CWE-294
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenClaw
Affected software:
OpenClaw
OpenClaw
Detailed vulnerability description
The vulnerability allows a remote attacker to trigger duplicate inbound processing.
The vulnerability exists due to authentication bypass by capture-replay in the Nextcloud Talk webhook path when handling previously valid signed webhook requests without durable replay suppression. A remote attacker can replay a captured signed request to trigger duplicate inbound processing.
The issue is limited to deployments using the Nextcloud Talk webhook integration and may be triggered after replay-window expiry or process restart.
How to mitigate CVE-2026-28449
Install security update from vendor's website.