CVE-2026-2994: Concrete5/concrete5 Concrete CMS Vulnerable To Cross-Site Vulnerability

LOW
Advisory Identifier: GHSA-6mxw-2vhf-42g5
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CWE-352
Published
Advisory Summary

CVE-2026-2994 is a LOW concrete cms vulnerable to cross-site vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Concrete5/concrete5 libraries in the Packagist ecosystem. The issue involves concrete cms vulnerable to cross-site request forgery (csrf). Remediation is available by upgrading affected packages to version 9.4.8.

CVE-2026-2994 at a Glance

CVE Identifier CVE-2026-2994
GHSA Identifier GHSA-6mxw-2vhf-42g5
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Concrete5/concrete5
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-2994

To remediate this vulnerability, upgrade all affected Concrete5/concrete5 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

concrete5/concrete5 fixed: 9.4.8 
Upgrade concrete5/concrete5 to 9.4.8
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for concrete5/concrete5

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-2994, inspect your project dependencies for Concrete5/concrete5:

inspect dependencies for concrete5/concrete5

Analyze the terminal output to locate any version of Concrete5/concrete5 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.4.8), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. In Concrete5/concrete5, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Concrete CMS below version 9.4.8 is subject to CSRF by a Rogue Administrator using the Anti-Spam Allowlist Group Configuration via group_id parameter which can leads to a security bypass since changes are saved prior to checking the CSRF token.  The Concrete CMS security team thanks z3rco for reporting

CVE-2026-2994 Affected Concrete5/concrete5 Versions

1 component(s)
Fixed Versions:
9.4.8
Product / Package Ecosystem Affected Versions Fixed Version
concrete5/concrete5
 Packagist
< 9.4.8
9.4.8

References

NVD — CVE-2026-2994 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-2994
Concrete5/concrete5 Source Repository REPOSITORY
https://github.com/concretecms/concretecms/pull/12826
documentation.concretecms.org/9-x/developers/intr... WEB
https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes
Concrete5/concrete5 Source Repository REPOSITORY
https://github.com/concretecms/concretecms

Frequently Asked Questions

What is CVE-2026-2994?
CVE-2026-2994 is a security vulnerability in Concrete5/concrete5 involving Concrete CMS vulnerable to Cross-Site Request Forgery (CSRF) under CWE-352: Cross-Site Request Forgery (CSRF).
Which Concrete5/concrete5 versions are affected?
Affected versions include releases prior to 9.4.8 across affected packages: concrete5/concrete5.
What version fixes CVE-2026-2994?
Upgrading to 9.4.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is concrete5/concrete5 affected?
Yes, concrete5/concrete5 is affected in releases prior to 9.4.8. Upgrade your dependency to 9.4.8 or later.
What CWE is associated with CVE-2026-2994?
CVE-2026-2994 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check Packagist dependencies for CVE-2026-2994?
Run the dependency tree command: 'inspect dependencies for concrete5/concrete5'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6mxw-2vhf-42g5",
  "modified" : "2026-03-04T21:34:58Z",
  "published" : "2026-03-04T03:31:34Z",
  "aliases" : [ "CVE-2026-2994" ],
  "summary" : "Concrete CMS vulnerable to Cross-Site Request Forgery (CSRF)",
  "details" : "Concrete CMS below version 9.4.8 is subject to CSRF by a Rogue Administrator using the Anti-Spam Allowlist Group Configuration via group_id parameter which can leads to a security bypass since changes are saved prior to checking the CSRF token. \n\nThe Concrete CMS security team thanks z3rco for reporting",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "concrete5/concrete5"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "9.4.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-2994"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/concretecms/concretecms/pull/12826"
  }, {
    "type" : "WEB",
    "url" : "https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/concretecms/concretecms"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-04T21:34:58Z",
    "nvd_published_at" : "2026-03-04T03:16:04Z"
  }
}