What’s Vulnerable › Vulnerabilities

CVE-2026-109162: TYPO3 CMS - Security Misconfiguration in Form Framework

• Severity: medium (CVSS 6.3 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: 2026-10-13 · updated 2026-10-16
• Weakness: CWE-552

Description

Forms using FileUpload or ImageUpload elements with a custom saveToFileMount configured stored uploaded files in the default storage folder 1:/user_upload/ instead of the configured destination. This could cause uploaded files to end up in a publicly accessible storage even though a restricted, non-public storage had been configured. Files stored this way are served directly, without the access checks applied to non-public storages. Forms that use the default value for saveToFileMount are not affected. This issue affects TYPO3 CMS versions 14.0.0-14.3.8.

Affected products

• typo3: from 14.0.0 before 14.3.9 — fixed in 14.3.9

How to fix

Upgrade to a fixed version: typo3 14.3.9. Check the vendor advisory for mitigations.

References

• https://github.com/TYPO3/typo3/commit/cc3e8e28b0e830aaf6ad857272f3f2dc3c4ede12
• https://github.com/TYPO3/typo3/commit/f536f75c6bd3456165e4200e5df1b236ddeae3b0
• https://news.typo3.com/security/advisory/typo3-core-sa-2026-024

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