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Low, CVSS 2.1

TYPO3 CMS has Broken Access Control in its File Abstraction Layer

CVE-2026-49738GHSA-jf56-v8jc-jcc5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (typo3/cms-core 14.3.3, 13.4.31, 12.4.46, 11.5.51, 10.4.57), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist typo3/cms-core

    Affected
    < 10.4.57>= 11.0.0, < 11.5.51>= 12.0.0, < 12.4.46>= 13.0.0, < 13.4.31>= 14.0.0, < 14.3.3
    Fixed in
    11.5.51, 13.4.31, 10.4.57, 12.4.46, 14.3.3

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
2.1 · CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2026-49738: 0.36% estimated exploitation activity in the next 30 days; percentile 29.34 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Problem The path allowance check in GeneralUtility::isAllowedAbsPath() performed a plain string prefix comparison without requiring a directory separator boundary, causing a path like /var/www/html-other/secret.yaml to be incorrectly accepted as valid when the project root was /var/www/html. Administrator users with access to the File Abstraction Layer were able to create new file storage definitions pointing to directories outside the project root, bypassing this path check. Solution Update to TYPO3 versions 10.4.57 ELTS, 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 Wolfgang Klinger for reporting this issue, and to TYPO3 core & security team member Oliver Hader for fixing it. Resources TYPO3-CORE-SA-2026-016

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-jf56-v8jc-jcc5

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-49738

Advisory: TYPO3 CMS has Broken Access Control in its File Abstraction Layer
IDs: CVE-2026-49738, GHSA-jf56-v8jc-jcc5
Record: https://patchnext.com/advisories/cve-2026-49738 (revision 1, source checked 26 Oct 2026, 14:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: typo3/cms-core 14.3.3, 13.4.31, 12.4.46, 11.5.51, 10.4.57. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist typo3/cms-core: affected < 10.4.57; >= 11.0.0, < 11.5.51; >= 12.0.0, < 12.4.46; >= 13.0.0, < 13.4.31; >= 14.0.0, < 14.3.3; fixed in 11.5.51, 13.4.31, 10.4.57, 12.4.46, 14.3.3

## Suggested inspection (read-only)
- Packagist typo3/cms-core: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on typo3/cms-core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-jf56-v8jc-jcc5 (GitHub-reviewed advisory GHSA-jf56-v8jc-jcc5 lists affected ranges: Packagist typo3/cms-core >=0 =11.0.0 =12.0.0 =13.0.0 =14.0.0 <14.3.3)

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