Vulnerability details
CVE-2026-30940
baserproject basercms
baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE
CVSS 3.1
7.2High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.2High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| baserproject | basercms | < 5.2.3 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/baserproject/basercms/security/advisories/GHSA-c5c6-37vq-pjcq x_refsource_CONFIRM
- https://basercms.net/security/JVN_20837860 x_refsource_MISC
- https://github.com/baserproject/basercms/releases/tag/5.2.3 x_refsource_MISC
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Details
- Published
- 2026-03-31
- Last updated
- 2026-04-02
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
1.06%
Probability of exploitation in 30 days
64.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CWE-73External Control of File Name or Path