Path traversal in Crow - #VU147370
Published: September 8, 2026
Vulnerability identifier: #VU147370
CSH Severity: Medium
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to access and modify JSON files outside the configured session directory.
The vulnerability exists due to improper limitation of a pathname to a restricted directory in the FileStore session middleware when processing a client-supplied session cookie. A remote attacker can submit a traversal session cookie to access and modify session-compatible JSON files outside the configured session directory.
Exploitation requires FileStore to be selected and a targeted existing .json file to be accessible to the Crow process and accepted as JSON.
Affected software
Crow
Remediation
Install security update from vendor's website.
Crow - update to 1.3.4