TYPO3 Arbitrary Code Execution and Cross-Site Scripting in Backend API
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- —
- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-79.
Summary
Backend API configuration using Page TSconfig is vulnerable to arbitrary code execution and cross-site scripting. TSconfig fields of page properties in backend forms can be used to inject malicious sequences. Field tsconfig_includes is vulnerable to directory traversal leading to same scenarios as having direct access to TSconfig settings. A valid backend user account having access to modify values for fields `pages.TSconfig` and `pages.tsconfig_includes` is needed in order to exploit this vulnerability.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | typo3/cms-core (Packagist) | 8.0.0 to before 8.7.27 | 8.7.27 | Patch available | GHSA-x428-565f-8xj2 |
| — | typo3/cms-core (Packagist) | 9.0.0 to before 9.5.8 | 9.5.8 | Patch available | GHSA-x428-565f-8xj2 |
- typo3/cms-core (Packagist) Vendor— Affected 8.0.0 to before 8.7.27 Fixed in 8.7.27 Patch available GHSA-x428-565f-8xj2
- typo3/cms-core (Packagist) Vendor— Affected 9.0.0 to before 9.5.8 Fixed in 9.5.8 Patch available GHSA-x428-565f-8xj2
Remediation
- Fix · GHSA-x428-565f-8xj2 typo3/cms-core (Packagist) Fixed in 8.7.27 Advisory →
- Fix · GHSA-x428-565f-8xj2 typo3/cms-core (Packagist) Fixed in 9.5.8 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-x428-565f-8xj2
References
Other 5
- https://github.com/TYPO3-CMS/core/commit/3a99a0877de6ad9cb39ba73146292b90e13294db
- https://github.com/TYPO3-CMS/core/commit/822e62ec267fbe3c70a26f1c4f73f47fc615c930
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/2019-06-25-4.yaml
- https://github.com/TYPO3-CMS/core
- https://typo3.org/security/advisory/typo3-core-sa-2019-019
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences