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

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Summary

CVECVE-2026-30940
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-31 01:16:36 UTC
Updated2026-04-01 20:26:17 UTC
DescriptionbaserCMS 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.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002040000 probability, percentile 0.424870000 (date 2026-04-01)

Problem Types: CWE-22 | CWE-73 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-73 CWE-73: External Control of File Name or Path

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Basercms Basercms All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Baserproject Basercms affected < 5.2.3 Not specified

References

ReferenceSourceLinkTags
github.com/baserproject/basercms/releases/tag/5.2.3 [email protected] github.com Release Notes
github.com/baserproject/basercms/security/advisories/GHSA-c5c6-37vq-pjcq [email protected] github.com Exploit, Vendor Advisory
basercms.net/security/JVN_20837860 [email protected] basercms.net Vendor Advisory
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