CVE-2026-49738: TYPO3 CMS - Broken Access Control in File Abstraction Layer

Severity: low (CVSS 2.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-09 · updated 2026-07-23
Weakness: CWE-22

Description

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. This issue affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30 and 14.0.0-14.3.2.

Affected products

typo3: before 10.4.57; from 11.0.0 before 11.5.51; from 12.0.0 before 12.4.46; from 13.0.0 before 13.4.31; from 14.0.0 before 14.3.3 — fixed in 10.4.57, 11.5.51, 12.4.46, 13.4.31, 14.3.3

How to fix

Upgrade to a fixed version: typo3 10.4.57, 11.5.51, 12.4.46, 13.4.31. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-49738 or the next vulnerability affects your stack