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CVE-2026-30940

baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE

Published: Mar 31, 2026Updated: Apr 1, 2026 Sources: CVE List NVDCWE-22
NVD MITRE
7.2CVSSHIGH
EPSS Score
1.0%
Top 40.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

baserCMS is a website development framework. Prior to version 5.2.3, a path traversal vulnerability exists in the theme file management API (/baser/api/admin/bc-theme-file/theme_files/add.json) that allows arbitrary file write. An authenticated administrator can include ../ sequences in the path parameter to create a PHP file in an arbitrary directory outside the theme directory, which may result in remote code execution (RCE). This issue has been patched in version 5.2.3.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-22CWE-73

Affected Products

basercmsbaserproject
On-prem
Web & CMS Plugins / cms-core
basercmsbasercms
On-premWeb App
Web & CMS Plugins / cms-core
baserprojectoss-projectWeb & CMS Pluginsaka basercms
basercmscommercialWeb & CMS Plugins

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/baserproject/basercms/security/advisories/GHSA-c5c6-37vq-pjcq
github.com
https://basercms.net/security/JVN_20837860
basercms.net
https://github.com/baserproject/basercms/releases/tag/5.2.3
github.com

Timeline

Published
Mar 31, 2026
Last Updated
Apr 1, 2026

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