CVE-2026-41402: OpenClaw < 2026.3.31 - Webhook Replay Cache Cross-Target messageId Scope Bypass

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-28 · updated 2026-06-17
Weakness: CWE-706

Description

OpenClaw before 2026.3.31 contains a scope bypass vulnerability in webhook replay cache deduplication that allows authenticated attackers to replay messages across sibling targets using the same messageId. Attackers can exploit overly broad cache keying to bypass replay protection and deliver duplicate webhook messages to unintended targets.

Affected products

OpenClaw: before 2026.3.31 — fixed in 2026.3.31

How to fix

Upgrade to a fixed version: OpenClaw 2026.3.31. Check the vendor advisory for mitigations.

References

https://github.com/openclaw/openclaw/commit/4d038bb242c11f39e45f6a4bde400e5fd42e4ebf
https://github.com/openclaw/openclaw/security/advisories/GHSA-hhq4-97c2-p447
https://www.vulncheck.com/advisories/openclaw-webhook-replay-cache-cross-target-messageid-scope-bypass

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