CVE-2026-49742: Typo3/cms core TYPO3 CMS Has Broken Access Vulnerability

HIGH
Advisory Identifier: GHSA-chm7-4vch-h8vr
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CWE-200 CWE-22
Published
Advisory Summary

CVE-2026-49742 is a HIGH typo3 cms has broken access vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Typo3/cms core libraries in the Packagist ecosystem. The issue involves typo3 cms has broken access control in its media module. Remediation is available by upgrading affected packages to version 11.5.51, 12.4.46, 13.4.31, 14.3.3.

CVE-2026-49742 at a Glance

CVE Identifier CVE-2026-49742
GHSA Identifier GHSA-chm7-4vch-h8vr
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Typo3/cms core
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-49742

To remediate this vulnerability, upgrade all affected Typo3/cms core 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-core fixed: 11.5.51 
Upgrade typo3/cms-core to 11.5.51
typo3/cms-core fixed: 12.4.46 
Upgrade typo3/cms-core to 12.4.46
typo3/cms-core fixed: 13.4.31 
Upgrade typo3/cms-core to 13.4.31
typo3/cms-core fixed: 14.3.3 
Upgrade typo3/cms-core to 14.3.3
typo3/cms-filelist fixed: 11.5.51 
Upgrade typo3/cms-filelist to 11.5.51
typo3/cms-filelist fixed: 12.4.46 
Upgrade typo3/cms-filelist to 12.4.46
typo3/cms-filelist fixed: 13.4.31 
Upgrade typo3/cms-filelist to 13.4.31
typo3/cms-filelist fixed: 14.3.3 
Upgrade typo3/cms-filelist to 14.3.3
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-core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-49742, inspect your project dependencies for Typo3/cms core:

inspect dependencies for typo3/cms-core

Analyze the terminal output to locate any version of Typo3/cms core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 11.5.51), 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-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Typo3/cms core, 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

### Problem Backend users with file download permissions were able to download files from the fallback storage of the file abstraction layer (FAL) via the Media Module. Since the fallback storage resolves paths relative to the server's document root, this could expose sensitive files such as log files. ### Solution Update to TYPO3 versions 11.5.51 ELTS, 12.4.46 ELTS, 13.4.31 LTS, 14.3.3 LTS that fix the problem described. ### Credits TYPO3 CMS thanks Hyunseo Shin for reporting this issue, and to TYPO3 security team member Torben Hansen for fixing it. ### Resources * [TYPO3-CORE-SA-2026-013](https://typo3.org/security/advisory/typo3-core-sa-2026-013)

CVE-2026-49742 Affected Typo3/cms core Versions

8 component(s)
Fixed Versions:
11.5.5112.4.4613.4.3114.3.3
Product / Package Ecosystem Affected Versions Fixed Version
typo3/cms-core
 Packagist
≥ 11.0.0
< 11.5.51
11.5.51
typo3/cms-core
 Packagist
≥ 12.0.0
< 12.4.46
12.4.46
typo3/cms-core
 Packagist
≥ 13.0.0
< 13.4.31
13.4.31
typo3/cms-core
 Packagist
≥ 14.0.0
< 14.3.3
14.3.3
typo3/cms-filelist
 Packagist
≥ 11.0.0
< 11.5.51
11.5.51
typo3/cms-filelist
 Packagist
≥ 12.0.0
< 12.4.46
12.4.46
typo3/cms-filelist
 Packagist
≥ 13.0.0
< 13.4.31
13.4.31
typo3/cms-filelist
 Packagist
≥ 14.0.0
< 14.3.3
14.3.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/TYPO3/typo3/security/advisories/GHSA-chm7-4vch-h8vr
NVD — CVE-2026-49742 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49742
Security Fix Commit FIX COMMIT
https://github.com/TYPO3/typo3/commit/ad636b6183843b57c758a1e12174a75093ac93c3
Security Fix Commit FIX COMMIT
https://github.com/TYPO3/typo3/commit/caa6b444d7ab1bdd1eb76a68004c8be73d98e6ae
Typo3/cms core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2026-49742.yaml
Typo3/cms core Source Repository REPOSITORY
https://github.com/TYPO3/typo3
Typo3/cms core Security Information SECURITY
https://typo3.org/security/advisory/typo3-core-sa-2026-013

Frequently Asked Questions

What is CVE-2026-49742?
CVE-2026-49742 is a security vulnerability in Typo3/cms core involving TYPO3 CMS has Broken Access Control in its Media Module under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Typo3/cms core versions are affected?
Affected versions include releases prior to 11.5.51, 12.4.46, 13.4.31, 14.3.3 across affected packages: typo3/cms-core, typo3/cms-filelist.
What version fixes CVE-2026-49742?
Upgrading to 11.5.51, 12.4.46, 13.4.31, 14.3.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is typo3/cms-core affected?
Yes, typo3/cms-core is affected in releases prior to 11.5.51, 12.4.46, 13.4.31, 14.3.3. Upgrade your dependency to 11.5.51, 12.4.46, 13.4.31, 14.3.3 or later.
Is typo3/cms-filelist affected?
Yes, typo3/cms-filelist is affected in releases prior to 11.5.51, 12.4.46, 13.4.31, 14.3.3. Upgrade your dependency to 11.5.51, 12.4.46, 13.4.31, 14.3.3 or later.
What CWE is associated with CVE-2026-49742?
CVE-2026-49742 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Packagist dependencies for CVE-2026-49742?
Run the dependency tree command: 'inspect dependencies for typo3/cms-core'. 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-chm7-4vch-h8vr",
  "modified" : "2026-06-12T19:09:30Z",
  "published" : "2026-06-12T19:09:30Z",
  "aliases" : [ "CVE-2026-49742" ],
  "summary" : "TYPO3 CMS has Broken Access Control in its Media Module",
  "details" : "### Problem\nBackend users with file download permissions were able to download files from the fallback storage of the file abstraction layer (FAL) via the Media Module. Since the fallback storage resolves paths relative to the server's document root, this could expose sensitive files such as log files.\n\n### Solution\nUpdate to TYPO3 versions 11.5.51 ELTS, 12.4.46 ELTS, 13.4.31 LTS, 14.3.3 LTS that fix the problem described.\n\n### Credits\nTYPO3 CMS thanks Hyunseo Shin for reporting this issue, and to TYPO3 security team member Torben Hansen for fixing it.\n\n### Resources\n* [TYPO3-CORE-SA-2026-013](https://typo3.org/security/advisory/typo3-core-sa-2026-013)",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0"
      }, {
        "fixed" : "11.5.51"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "12.0.0"
      }, {
        "fixed" : "12.4.46"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "13.0.0"
      }, {
        "fixed" : "13.4.31"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "14.0.0"
      }, {
        "fixed" : "14.3.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-filelist"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0"
      }, {
        "fixed" : "11.5.51"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-filelist"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "12.0.0"
      }, {
        "fixed" : "12.4.46"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-filelist"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "13.0.0"
      }, {
        "fixed" : "13.4.31"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-filelist"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "14.0.0"
      }, {
        "fixed" : "14.3.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/TYPO3/typo3/security/advisories/GHSA-chm7-4vch-h8vr"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-49742"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TYPO3/typo3/commit/ad636b6183843b57c758a1e12174a75093ac93c3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TYPO3/typo3/commit/caa6b444d7ab1bdd1eb76a68004c8be73d98e6ae"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2026-49742.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/TYPO3/typo3"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/security/advisory/typo3-core-sa-2026-013"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-12T19:09:30Z",
    "nvd_published_at" : "2026-06-09T11:16:53Z"
  }
}