Vulnerability details
CVE-2026-115481
baserproject basercms
baserCMS: BcCustomContent file fields can be configured to allow executable file extensions such as php, leading to arbitrary PHP file upload
CVSS 4.0
8.5High
Official description
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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.5High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | 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
| Vendor | Product | Versions | Source |
|---|---|---|---|
| baserproject | basercms | >= 5.0.0-beta1, < 5.3.2 | CVEProject cvelistV5 (CNA) |
| baserproject | basercms | >= 5.4.0, < 5.4.2 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://github.com/baserproject/basercms/security/advisories/GHSA-8jrp-4h7c-m679 x_refsource_CONFIRM
- https://github.com/baserproject/basercms/commit/2ed19c878add5c26fc765572e0e77173c1f1fdb5 x_refsource_MISC
- https://github.com/baserproject/basercms/commit/b0ef31b10dc6267b48ebc9a80d34bc7c4c09c311 x_refsource_MISC
- https://github.com/baserproject/basercms/releases/tag/5.3.2 x_refsource_MISC
- https://github.com/baserproject/basercms/releases/tag/5.4.2 x_refsource_MISC
Kolun on Telegram @kolunsec
Exploited CVEs, key news and a daily digest
Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.
Details
- Published
- 2026-10-23
- Last updated
- 2026-10-23
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.4%
Probability of exploitation in 30 days
34.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-434Unrestricted Upload of File with Dangerous Type