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Medium

Concrete CMS Vulnerable to Cross-Site Request Forgery (CSRF) and Cross-Site Scripting (XSS)

  • Disclosed: 03.04.2025
  • Updated: 11.10.2026 10:22

Concrete CMS version 9 below 9.4.0RC2 and versions below 8.5.20 are vulnerable to CSRF and XSS in the Concrete CMS Address attribute because addresses are not properly sanitized in the output when a country is not specified.  Attackers are limited to individuals whom a site administrator has granted the ability to fill in an address attribute. It is possible for the attacker to glean limited information from the site but amount and type is restricted by mitigating controls and the level of access of the attacker. Limited data modification is possible. The dashboard page itself could be rendered unavailable. The fix only sanitizes new data uploaded post update to Concrete CMS 9.4.0RC2. Existing database entries added before the update will still be “live” if there were successful exploits added under previous versions; a database search is recommended. The Concrete CMS security team gave this vulnerability CVSS v.4.0 score of 5.1 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L Thanks Myq Larson for reporting.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package concrete5/concrete5 >= 9.0.0, < 9.4.0RC2, < 8.5.20 9.4.0RC2, 8.5.20

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness (CWE)
CWE-79
Platform
Composer
Package
concrete5/concrete5
Disclosed
03.04.2025
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-cmm4-p9v2-q453 - CC BY 4.0

Vulnerability history: concrete5/concrete5

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 (121) in the archive
Total entries
121
First → latest
10.2021 06.2026
Without a fix
10
Exploited in attacks
0

Severity breakdown

  • Critical 2
  • High 16
  • Medium 65
  • Low 38

Disclosures per year

Severity:
  1. Concrete CMS: PHP Object Injection via unserialize() calls
    High CVE-2026-10721 < 9.5.2 9.5.2
  2. Concrete CMS is vulnerable to PHP Object Injection via unserialize() calls in the Workflow, Form block, and File/Set components
    High CVE-2026-7888 < 9.5.2 9.5.2
  3. Concrete does not validate a CSRF token before processing requests to `/dashboard/extend/update/do_update/<pkgHandle>`
    High CVE-2026-8417 < 9.5.1 9.5.1
  4. Concrete CMS does not validate a CSRF token before processing requests to `/dashboard/extend/update/prepare_remote_upgrade/<remoteMPID>`
    High CVE-2026-8426 < 9.5.1 9.5.1
  5. Concrete CMS contains a CSRF vulnerability
    High CVE-2026-8421 < 9.5.1 9.5.1
  6. Concrete CMS is Vulnerable to Cross-Site Request Forgery
    High CVE-2026-8428 < 9.5.1 9.5.1
  7. Concrete CMS is vulnerable to missing authorization in the bulk_user_assignment.php
    High CVE-2026-8350 < 9.5.1 9.5.1
  8. Concrete CMS has Stored XSS through its height parameter
    High CVE-2026-8203 < 9.5.1 9.5.1
  9. Concrete CMS is Vulnerable to Cross-Site Request Forgery
    High CVE-2026-8140 < 9.5.1 9.5.1
  10. Concrete CMS Vulnerable to Deserialization of Untrusted Data
    High CVE-2026-8135 < 9.5.1 9.5.1
  11. Concrete CMS is vulnerable to Stored XSS via OAuth integration name
    High CVE-2026-8197 < 9.5.1 9.5.1
  12. Concrete CMS Vulnerable to Relative Path Traversal
    Critical · 7.2 CVE-2026-8134 < 9.5.1 9.5.1
  13. Concrete CMS vulnerable to Remote Code Execution by stored PHP object injection
    High CVE-2026-3452 < 9.4.8 9.4.8
  14. Concrete CMS Vulnerable to Cross-Site Request Forgery (CSRF) and Cross-Site Scripting (XSS) this entry
    Medium CVE-2025-3153 >= 9.0.0, < 9.4.0RC2, < 8.5.20 9.4.0RC2, 8.5.20
  15. Concrete CMS (previously concrete5) is vulnerable to possible auth bypass in the jobs section
    Critical · 9.8 CVE-2023-28473 < 9.2.0 9.2.0
  16. Concrete CMS vulnerable to Cross-site Request Forgery
    High · 8.8 CVE-2022-43693 < 8.5.10, >= 9.0.0RC1, < 9.1.3 8.5.10, 9.1.3
  17. Cross Site Request Forgery in concrete5/concrete5
    High CVE-2021-22954 < 9.0.0 9.0.0
  18. Unrestricted Uploads in Concrete5
    High · 7.2 CVE-2020-11476 < 8.5.3 8.5.3
  19. Server-Side Request Forgery vulnerability in concrete5
    High · 8.2 CVE-2021-22958 < 8.5.5 8.5.5

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