GHSA-G776-759R-PF6X

It has been discovered that the Import/Export module is susceptible to broken access control. Regular backend users have access to import functionality which usually only is available to admin users or users having User TSconfig setting options.impexp.enableImportForNonAdminUser explicitly enabled.

Database content to be imported however was correctly checked against users’ permissions and not affected. However it was possible to upload files by-passing restrictions of the file abstraction layer (FAL) - however this did not affect executable files which have been correctly secured by fileDenyPattern.

Currently the only known vulnerability is to directly inject *.form.yaml files which could be used to trigger the vulnerability of TYPO3-CORE-SA-2018-003 (privilege escalation & SQL injection) - which requires the Form Framework (ext:form) being available on an according website. CVSSv3 scoring is based on this scenario.

A valid backend user account is needed in order to exploit this vulnerability.

The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions. Typical impact: unauthorized data access or execution of privileged operations.

GHSA-G776-759R-PF6X has a CVSS score of 4.3 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (9.5.8); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is GHSA-G776-759R-PF6X? GHSA-G776-759R-PF6X is a medium-severity incorrect authorization vulnerability in typo3/cms-core (composer), affecting versions >= 9.3.0, < 9.5.8. It is fixed in 9.5.8. The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions.
2. How severe is GHSA-G776-759R-PF6X? GHSA-G776-759R-PF6X has a CVSS score of 4.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of typo3/cms-core are affected by GHSA-G776-759R-PF6X? typo3/cms-core (composer) versions >= 9.3.0, < 9.5.8 is affected.
4. Is there a fix for GHSA-G776-759R-PF6X? Yes. GHSA-G776-759R-PF6X is fixed in 9.5.8. Upgrade to this version or later.
5. Is GHSA-G776-759R-PF6X exploitable, and should I be worried? Whether GHSA-G776-759R-PF6X 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
6. What actually determines whether GHSA-G776-759R-PF6X 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.
7. How do I fix GHSA-G776-759R-PF6X? Upgrade typo3/cms-core to 9.5.8 or later.

Other vulnerabilities in typo3/cms-core