CVE-2026-115481highCWE-434

CVE-2026-115481: high-severity vulnerability in baserproject basercms

baserCMS: BcCustomContent file fields can be configured to allow executable file extensions such as php, leading to arbitrary PHP file upload

Published

Follow this CVE+ Monitor basercms

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.5epss 0.4%
baserCMS is a website development framework. Starting in version 5.0.0-beta1 and prior to versions 5.3.2 and 5.4.2, `PermissionGroupsService::build()` reads a plugin's `config/permission.php` to decide what each user group may reach. When that file is absent it writes a wildcard allow rule instead: `url` `/baser/<prefix>/<plugin>/*`, `method` `*`, `auth` true, for every non-admin group. BcCustomContent has no such file in any release. After an administrator installs it, the default `operators` group can store and execute arbitrary PHP under the document root. Versions 5.3.2 and 5.4.2 patch the issue.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
baserproject · basercms
Related CVEs — baserproject basercms

In the same product, most dangerous first.

CVE-2026-21861CRITICALbaserCMS: OS Command Injection Leading to Remote Code Execution (RCE)EPSS 2.3%CVE-2020-15277HIGHRemote Code Execution in baserCMSEPSS 2.3%CVE-2021-41243CRITICALOS Command Injection Vulnerability and Potential Zip Slip VulnerabilityEPSS 2.2%CVE-2020-15159HIGHCross Site Scripting leading to RCE in baserCMSEPSS 2.2%CVE-2026-30880CRITICALbaserCMS: OS command injection vulnerability in installerEPSS 2.1%CVE-2021-41279HIGHZip Slip Vulnerability in BaserCMSEPSS 1.6%