Insecure Deserialization in TYPO3 CMS
Priority LOW 38CWE-502Published · Updated
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- Code execution
- Confidentiality · integrity · availability
- —
- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-502.
Summary
It has been discovered that the Form Framework (system extension "form") is vulnerable to Insecure Deserialization when being used with the additional PHP PECL package “yaml”, which is capable of unserializing YAML contents to PHP objects. A valid backend user account as well as having PHP setting "yaml.decode_php" enabled is needed to exploit this vulnerability (which is the default value according to PHP documentation).
Why it matters now
Fix Fixed typo3/cms (Packagist): 8.7.17, 9.3.2
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 (Packagist) | 8.5.0 to before 8.7.17 | 8.7.17 | Patch available | GHSA-8h28-f46f-m87h |
| — | typo3/cms (Packagist) | 9.0.0 to before 9.3.2 | 9.3.2 | Patch available | GHSA-8h28-f46f-m87h |
- typo3/cms (Packagist) Vendor— Affected 8.5.0 to before 8.7.17 Fixed in 8.7.17 Patch available GHSA-8h28-f46f-m87h
- typo3/cms (Packagist) Vendor— Affected 9.0.0 to before 9.3.2 Fixed in 9.3.2 Patch available GHSA-8h28-f46f-m87h
Remediation
- Fix · GHSA-8h28-f46f-m87h typo3/cms (Packagist) Fixed in 8.7.17 Advisory →
- Fix · GHSA-8h28-f46f-m87h typo3/cms (Packagist) Fixed in 9.3.2 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-8h28-f46f-m87h
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences