EUVD-2026-20781
GHSA-pg8g-f2hf-x82m
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
OpenClaw before 2026.3.31 (patched in 2026.4.8) contains a request body replay vulnerability in fetchWithSsrFGuard that allows unsafe request bodies to be resent across cross-origin redirects. Attackers can exploit this by triggering redirects to exfiltrate sensitive request data or headers to unintended origins.
AnalysisAI
Cross-origin request body replay in OpenClaw's fetchWithSsrFGuard function before version 2026.3.31 enables attackers to exfiltrate sensitive request data and headers to unintended origins through redirect manipulation. The vulnerability requires user interaction and allows high confidentiality impact through unsafe request body transmission across origin boundaries. Affects unauthenticated contexts. No public exploit identified at time of analysis, with low observed exploitation activity (EPSS <1%).
Technical ContextAI
The vulnerability stems from improper handling of HTTP redirects (CWE-601) in the fetchWithSsrFGuard security guard function. Request bodies are incorrectly replayed when following cross-origin redirects, violating same-origin policy protections. This architectural flaw enables redirect-based data exfiltration without proper origin validation during the request forwarding process.
RemediationAI
Vendor-released patch: version 2026.4.8 (released April 8, 2026). Upgrade immediately to OpenClaw 2026.4.8 or later, which implements proper origin validation in fetchWithSsrFGuard to prevent request body replay across redirects. The security fix is detailed in commit d7c3210cd6f5fdfdc1beff4c9541673e814354d5. Organizations unable to upgrade should disable or replace fetchWithSsrFGuard functionality and implement manual origin checking for all redirect-following requests. Review application logs for suspicious cross-origin redirect patterns. Full technical details and upgrade guidance: https://github.com/openclaw/openclaw/security/advisories/GHSA-qx8j-g322-qj6m and https://www.vulncheck.com/advisories/openclaw-unsafe-request-body-replay-via-fetchwithssrfguard-cross-origin-redirects
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