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CVE-2026-15305— TYPO3 CMS - Unrestricted File Upload in Form Framework

Quick assessment

Affected
TYPO3 TYPO3 CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TYPO3 TYPO3 CMS是TYPO3组织的内容管理系统。 TYPO3 CMS 14.2.0版本至14.3.5版本存在输入验证错误漏洞，该漏洞源于允许配置了allowedMimeTypes的FileUpload或ImageUpload元素上传任意MIME类型的文件，由于MimeTypeValidator在具体表单定义属性应用之前注册，导致验证器未添加到处理流程中。

AI Predicted 7.5 Difficulty: Easy EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
TYPO3 TYPO3 CMS 14.2.0< 14.3.5 affected
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I. Basic Information for CVE-2026-15305

Vulnerability Information
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Vulnerability Title
TYPO3 CMS - Unrestricted File Upload in Form Framework
Source: CVE Program / CVE List V5
Vulnerability Description
Users were able to upload files with arbitrary MIME types to forms using FileUpload or ImageUpload elements with allowedMimeTypes configured. The restriction was not enforced server-side because the MimeTypeValidator was registered during form building before concrete form definition properties were applied, resulting in the validator never being added to the processing pipeline. This issue affects TYPO3 CMS versions 14.2.0-14.3.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的类型区分
Source: CVE Program / CVE List V5
Vulnerability Title
TYPO3 CMS 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TYPO3 TYPO3 CMS是TYPO3组织的内容管理系统。 TYPO3 CMS 14.2.0版本至14.3.5版本存在输入验证错误漏洞，该漏洞源于允许配置了allowedMimeTypes的FileUpload或ImageUpload元素上传任意MIME类型的文件，由于MimeTypeValidator在具体表单定义属性应用之前注册，导致验证器未添加到处理流程中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TYPO3 TYPO3 CMS 14.2.0 ~ 14.3.5 -

II. Public POCs for CVE-2026-15305

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III. Intelligence Information for CVE-2026-15305

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Patches & Fixes for CVE-2026-15305 (2)

Vendor Advisories for CVE-2026-15305 (1)

IV. Related Vulnerabilities

Same product: TYPO3 CMS
Same vendor: TYPO3
Same weakness: CWE-351

V. Comments for CVE-2026-15305

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