TYPO3 CMS - Security Misconfiguration in Form Framework

published 2026-10-13 27 d ago modified 2026-10-16 23 d ago also EUVD-2026-98410

cvss: 6.3; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 2

TYPO3 TYPO3 CMS 14.3.9

github.com/TYPO3/typo3@cc3e8e2 commit
github.com/TYPO3/typo3@f536f75 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 23 d ago (2026-10-16)

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

TYPO3 TYPO3 CMS

Classification

Weakness

CWE-696 Incorrect Behavior Order
CWE-552 Files or Directories Accessible to External Parties

References

Sources

CVE List CVE-2026-109162
NVD CVE-2026-109162

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary