Path traversal in Flarum - CVE-2023-27577
Published: March 10, 2023 / Updated: April 20, 2026
Vulnerability identifier: #VU126529
CSH Severity: Low
CVSS v4: 7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-27577
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to read sensitive server files.
The vulnerability exists due to path traversal in the LESS parser when processing custom LESS settings. A remote privileged user can provide an absolute path to a sensitive file to read sensitive server files.
Exploitation requires control of an admin account.
Affected software
Flarum
How to mitigate CVE-2023-27577
Install security update from vendor's website.
Flarum - update to 1.7.0