CVE-2025-59014: Typo3/cms backend Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-xrcq-533q-8rxw
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CWE-248
Published
Advisory Summary

CVE-2025-59014 is a MODERATE denial of service vulnerability (CWE-248: Uncaught Exception) affecting Typo3/cms backend libraries in the Packagist ecosystem. The issue involves typo3 bookmark toolbar vulnerable to denial of service. Remediation is available by upgrading affected packages to version 12.4.37, 13.4.18.

CVE-2025-59014 at a Glance

CVE Identifier CVE-2025-59014
GHSA Identifier GHSA-xrcq-533q-8rxw
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-248: Uncaught Exception
Affected Product Typo3/cms backend
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2025-59014

To remediate this vulnerability, upgrade all affected Typo3/cms backend dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

typo3/cms-backend fixed: 12.4.37 
Upgrade typo3/cms-backend to 12.4.37
typo3/cms-backend fixed: 12.4.37 
Upgrade typo3/cms-backend to 12.4.37
typo3/cms-backend fixed: 13.4.18 
Upgrade typo3/cms-backend to 13.4.18
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 typo3/cms-backend

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-59014, inspect your project dependencies for Typo3/cms backend:

inspect dependencies for typo3/cms-backend

Analyze the terminal output to locate any version of Typo3/cms backend in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 12.4.37), 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-248: Uncaught Exception, where an exception is thrown from a function, but it is not caught. In Typo3/cms backend, 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

An uncaught exception in the Bookmark Toolbar of TYPO3 CMS versions 11.0.0–11.5.47, 12.0.0–12.4.36, and 13.0.0–13.4.17 lets administrator‑level backend users trigger a denial‑of‑service condition in the backend user interface by saving manipulated data in the bookmark toolbar.

CVE-2025-59014 Affected Typo3/cms backend Versions

3 component(s)
Fixed Versions:
12.4.3713.4.18
Product / Package Ecosystem Affected Versions Fixed Version
typo3/cms-backend
 Packagist
≥ 11.0.0
< 12.4.37
12.4.37
typo3/cms-backend
 Packagist
≥ 12.0.0
< 12.4.37
12.4.37
typo3/cms-backend
 Packagist
≥ 13.0.0
< 13.4.18
13.4.18

References

NVD — CVE-2025-59014 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59014
Security Fix Commit FIX COMMIT
https://github.com/TYPO3-CMS/backend/commit/04db7e25de1d3bb2d082ba68f7f974ccd917cc3f
Typo3/cms backend Source Repository REPOSITORY
https://github.com/TYPO3-CMS/backend
Typo3/cms backend Security Information SECURITY
https://typo3.org/security/advisory/typo3-core-sa-2025-018

Frequently Asked Questions

What is CVE-2025-59014?
CVE-2025-59014 is a security vulnerability in Typo3/cms backend involving TYPO3 Bookmark Toolbar vulnerable to denial of service under CWE-248: Uncaught Exception.
Which Typo3/cms backend versions are affected?
Affected versions include releases prior to 12.4.37, 13.4.18 across affected packages: typo3/cms-backend.
What version fixes CVE-2025-59014?
Upgrading to 12.4.37, 13.4.18 (or the latest patched release for your respective branch) resolves the vulnerability.
Is typo3/cms-backend affected?
Yes, typo3/cms-backend is affected in releases prior to 12.4.37, 13.4.18. Upgrade your dependency to 12.4.37, 13.4.18 or later.
What CWE is associated with CVE-2025-59014?
CVE-2025-59014 is classified under CWE-248: Uncaught Exception (An exception is thrown from a function, but it is not caught.).
How can I check Packagist dependencies for CVE-2025-59014?
Run the dependency tree command: 'inspect dependencies for typo3/cms-backend'. 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-xrcq-533q-8rxw",
  "modified" : "2025-09-09T20:10:26Z",
  "published" : "2025-09-09T09:31:12Z",
  "aliases" : [ "CVE-2025-59014" ],
  "summary" : "TYPO3 Bookmark Toolbar vulnerable to denial of service",
  "details" : "An uncaught exception in the Bookmark Toolbar of TYPO3 CMS versions 11.0.0–11.5.47, 12.0.0–12.4.36, and 13.0.0–13.4.17 lets administrator‑level backend users trigger a denial‑of‑service condition in the backend user interface by saving manipulated data in the bookmark toolbar.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-backend"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0"
      }, {
        "fixed" : "12.4.37"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 11.5.48"
    }
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-backend"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "12.0.0"
      }, {
        "fixed" : "12.4.37"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-backend"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "13.0.0"
      }, {
        "fixed" : "13.4.18"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-59014"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TYPO3-CMS/backend/commit/04db7e25de1d3bb2d082ba68f7f974ccd917cc3f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/TYPO3-CMS/backend"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/security/advisory/typo3-core-sa-2025-018"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-248" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-09-09T20:10:26Z",
    "nvd_published_at" : "2025-09-09T09:15:39Z"
  }
}