Vulnerability in Openclaw
CVE-2026-41395
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.003 · change: +0.001
Affected products
- Openclaw — versions 0, 2026.3.28
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-8689-gm9g-jgr6 (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/openclaw-webhook-replay-via-query-parameter-reorde… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-41395?
- CVE-2026-41395 is a high-severity vulnerability in Openclaw, classified under Missing Cryptographic Step. CVSS score: 7.5/10. Published 2026-04-28.
- How severe is CVE-2026-41395?
- High severity. CVSS v3 base score is 7.5 out of 10.