OpenClaw versions prior to 2026.2.12 fail to validate the sessionFile path parameter, allowing authenticated gateway clients to write transcript data to arbitrary locations on the host filesystem. Attackers can supply a sessionFile path outside the sessions directory to create files and append data repeatedly, potentially causing configuration corruption or denial of service.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/openclaw/openclaw/commit/25950bcbb8ba4d8cde002557f6e27c219ae…
disclosure@vulncheck.com
https://github.com/openclaw/openclaw/commit/4199f9889f0c307b77096a229b9e085b8d8…
disclosure@vulncheck.com
https://github.com/openclaw/openclaw/security/advisories/GHSA-64qx-vpxx-mvqf
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/openclaw-arbitrary-file-write-via-untruste…
disclosure@vulncheck.com