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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Openclaw Openclaw
cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*
|
— |
2026.2.25
|
References 3
https://github.com/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f49…
disclosure@vulncheck.com
https://github.com/openclaw/openclaw/security/advisories/GHSA-r9q5-c7qc-p26w
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/openclaw-webhook-replay-attack-via-missing…
disclosure@vulncheck.com