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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
7.2HIGH
NVD MITRE
EPSS Score
1.0%
Top 38.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not 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.

No summary for this CVE yet.

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

baserproject
oss-projectaka basercms
basercmsOn-prem
Web & CMS Plugins / cms-core
basercms
commercial
basercmsOn-premWeb App
Web & CMS Plugins / cms-core

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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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

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