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High

baserCMS has Unsafe File Upload Leading to Remote Code Execution (RCE)

  • Disclosed: 31.03.2026
  • Updated: 11.10.2026 10:22

Details

The application's restore function allows users to upload a .zip file, which is then automatically extracted. A PHP file inside the archive is included using require_once without validating or restricting the filename. An attacker can craft a malicious PHP file within the zip and achieve arbitrary code execution when it is included.

Vector: Malicious ZIP upload + insecure require_once

PoC

  1. Restore backup image
  2. Load file shell (insecure require_once) image image

Impact

Remote Code Execution (RCE)

Affected software

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PlatformPackageVulnerable versionsFixed in
Composer package baserproject/basercms < 5.2.3 5.2.3

References

CVSS score 8.7/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Weakness (CWE)
CWE-434
Platform
Composer
Package
baserproject/basercms
Disclosed
31.03.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-hv78-cwp4-8r7r - CC BY 4.0

Vulnerability history: baserproject/basercms

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (56) in the archive
Total entries
56
First → latest
08.2020 03.2026
Without a fix
7
Exploited in attacks
0

Severity breakdown

  • Critical 7
  • High 15
  • Medium 29
  • Low 5

Disclosures per year

Severity:
  1. baserCMS is Vulnerable to Cross-site Scripting
    High · 7.1 CVE-2026-32734 < 5.2.3 5.2.3
  2. baserCMS Path Traversal Leads to Arbitrary File Write and RCE via Theme File API
    High · 7.2 CVE-2026-30940 < 5.2.3 5.2.3
  3. baserCMS has OS command injection vulnerability in installer
    Critical CVE-2026-30880 < 5.2.3 5.2.3
  4. baserCMS Update Functionality Vulnerable to OS Command Injection
    Critical · 9.1 CVE-2026-30877 < 5.2.3 5.2.3
  5. baserCMS has OS Command Injection Leading to Remote Code Execution (RCE)
    Critical · 9.1 CVE-2026-21861 < 5.2.3 5.2.3
  6. baserCMS has Unsafe File Upload Leading to Remote Code Execution (RCE) this entry
    High · 8.7 CVE-2025-32957 < 5.2.3 5.2.3
  7. baserCMS allows any file to be uploaded
    Critical · 9.8 CVE-2023-25655 < 4.7.5 4.7.5
  8. baserCMS File Uploader Remote Code Execution (RCE) vulnerability
    Critical · 9.8 CVE-2023-25654 < 4.7.5 4.7.5
  9. CSRF in baserCMS 3.0.10 and earlier
    High · 8.8 CVE-2016-4881 < 3.0.11 3.0.11
  10. baserCMS Cross Site Request Forgery vulnerability
    High · 8.8 CVE-2016-4878 < 3.0.11 3.0.11
  11. OS Command Injection in baserCMS
    High · 8.8 CVE-2018-0569 >= 4.0.0, <= 4.1.0.1, <= 3.0.15 no fix
  12. baserCMS SQL Injection vulnerability
    Critical · 9.8 CVE-2017-10842 < 3.0.15, >= 4.0.0, < 4.0.6 3.0.15, 4.0.6
  13. Code Injection in baserCMS
    High · 8.8 CVE-2017-10844 <= 3.0.14, >= 4.0.0, <= 4.0.5 no fix
  14. baserCMS vulnerable to Access Control Bypass
    High · 8.1 CVE-2018-0572 >= 4.0.0, < 4.1.1, < 3.0.16 4.1.1, 3.0.16
  15. Arbitrary file delete in baserCMS
    High · 7.5 CVE-2017-10843 < 3.0.15, >= 4.0.0, < 4.0.6 3.0.15, 4.0.6
  16. CSRF in baserCMS 3.0.10 and earlier
    High · 8.8 CVE-2016-4879 <= 3.0.10 no fix
  17. RCE in baserCMS before 4.1.4
    High · 7.2 CVE-2018-18942 < 4.1.4 4.1.4
  18. OS Command Injection Vulnerability and Potential Zip Slip Vulnerability in baserCMS
    Critical · 9.1 CVE-2021-41243 < 4.5.4 4.5.4
  19. Potential Zip Slip Vulnerability in baserCMS
    High · 7.7 CVE-2021-41279 < 4.5.4 4.5.4
  20. Cross-site scripting vulnerability in file upload
    High · 8.7 CVE-2021-39136 < 4.5.1 4.5.1
  21. OS Command Injection in baserCMS
    High · 7.2 CVE-2021-20682 < 4.4.5 4.4.5
  22. Edit template, Remote Code Execution (RCE) Vulnerability in Latest Release 4.4.0
    High · 7.2 CVE-2020-15277 >= 4.4.0, < 4.4.1 4.4.1

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