critical9.1
CVE-2026-21861
baserCMS has OS Command Injection Leading to Remote Code Execution (RCE)
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | baserproject/basercms | <= 5.2.2 | 5.2.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Basercms | Basercms | before 5.2.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-qxmc-6f24-g86g
- https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86g
- https://nvd.nist.gov/vuln/detail/CVE-2026-21861
- https://basercms.net/security/JVN_20837860
- https://github.com/baserproject/basercms/releases/tag/5.2.3