High severity · published Apr 28, 2026
CVE-2026-41395
OpenClaw < 2026.3.28 - Webhook Replay via Query Parameter Reordering in Plivo V3
7.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenClaw · OpenClaw
before 2026.3.28 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41395
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41395
Vendor Advisory
https://github.com/openclaw/openclaw/security/advisories/GHSA-8689-gm9g-jgr6
Third Party Advisory
https://www.vulncheck.com/advisories/openclaw-webhook-replay-via-query-parameter-reordering-in-plivo-v3
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