Summary
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.
Credits
TYPO3 CMS thanks Hyunseo Shin for reporting this issue, and to TYPO3 security team member Torben Hansen for fixing it.
Resources
Impact
Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files. Typical impact: unauthorized file read or write outside the intended directory.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
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.
Frequently Asked Questions
- What is CVE-2026-49742? CVE-2026-49742 is a high-severity path traversal vulnerability in typo3/cms-core (composer), affecting versions >= 11.0.0, < 11.5.51. It is fixed in 11.5.51, 12.4.46, 13.4.31, 14.3.3. Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files.
- Which packages are affected by CVE-2026-49742?
typo3/cms-core(composer) (versions >= 11.0.0, < 11.5.51)typo3/cms-filelist(composer) (versions >= 11.0.0, < 11.5.51)
- Is there a fix for CVE-2026-49742? Yes. CVE-2026-49742 is fixed in 11.5.51, 12.4.46, 13.4.31, 14.3.3. Upgrade to this version or later.
- Is CVE-2026-49742 exploitable, and should I be worried? Whether CVE-2026-49742 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-49742 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-49742?
- Upgrade
typo3/cms-coreto 11.5.51 or later - Upgrade
typo3/cms-coreto 12.4.46 or later - Upgrade
typo3/cms-coreto 13.4.31 or later - Upgrade
typo3/cms-coreto 14.3.3 or later - Upgrade
typo3/cms-filelistto 11.5.51 or later - Upgrade
typo3/cms-filelistto 12.4.46 or later - Upgrade
typo3/cms-filelistto 13.4.31 or later - Upgrade
typo3/cms-filelistto 14.3.3 or later
- Upgrade