Path traversal in baserCMS - CVE-2026-62953
Published: July 30, 2026
Vulnerability identifier: #VU140527
CSH Severity: Low
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-62953
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to path traversal in PluginsService::add() and ThemesService::add() when handling uploaded filenames. A remote privileged user can supply a crafted filename in an upload request to execute arbitrary code.
If the webroot is writable, the uploaded payload can be written to a web-accessible location before ZIP validation fails, and no cleanup occurs afterward.
Affected software
baserCMS
How to mitigate CVE-2026-62953
Install security update from vendor's website.
baserCMS - update to 5.3.0