CVE-2026-41395: OpenClaw < 2026.3.28 - Webhook Replay via Query Parameter Reordering in Plivo V3

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% 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-325

Description

OpenClaw before 2026.3.28 contains a webhook replay vulnerability in Plivo V3 signature verification that canonicalizes query ordering for signatures but hashes raw URLs for replay detection. Attackers can reorder query parameters to bypass replay cache detection and trigger duplicate voice-call processing with a captured valid signed webhook.

Affected products

OpenClaw: before 2026.3.28 — fixed in 2026.3.28

How to fix

Upgrade to a fixed version: OpenClaw 2026.3.28. Check the vendor advisory for mitigations.

References

https://github.com/openclaw/openclaw/security/advisories/GHSA-8689-gm9g-jgr6
https://www.vulncheck.com/advisories/openclaw-webhook-replay-via-query-parameter-reordering-in-plivo-v3

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