CVE-2026-21861
Prior to version 5.2.3, baserCMS contains an OS command injection vulnerability in the core update functionality.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
baserCMS is a website development framework. Prior to version 5.2.3, baserCMS contains an OS command injection vulnerability in the core update functionality. An authenticated administrator can execute arbitrary OS commands on the server due to improper handling of user-controlled input that is directly passed to exec() without sufficient validation or escaping. This issue has been patched in version 5.2.3.
- CVSS 3.1
- 7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.28% probability · 82th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- basercms/basercms
- Source
- security-advisories@github.com
References
- https://basercms.net/security/JVN_20837860Vendor Advisory
- https://github.com/baserproject/basercms/releases/tag/5.2.3Release Notes
- https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86gExploit, Vendor Advisory
- https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86gExploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.