CVE-2026-15305
TYPO3 CMS - Unrestricted File Upload in Form Framework
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 14.2.0-14.3.5.
INFO
Published Date :
July 14, 2026, 1:18 p.m.
Last Modified :
July 14, 2026, 2:16 p.m.
Remotely Exploit :
Yes !
Source :
f4fb688c-4412-4426-b4b8-421ecf27b14a
Affected Products
The following products are affected by CVE-2026-15305
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | MEDIUM | f4fb688c-4412-4426-b4b8-421ecf27b14a | ||||
| CVSS 4.0 | MEDIUM | f4fb688c-4412-4426-b4b8-421ecf27b14a |
Solution
- Update TYPO3 CMS to a fixed version.
- Verify server-side MIME type validation is enforced.
- Review and correct form configurations if needed.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-15305.
| URL | Resource |
|---|---|
| https://typo3.org/security/advisory/typo3-core-sa-2026-020 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-15305 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-15305
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-15305 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-15305 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 14, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-15305', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-14T13:26:13.647808Z'} -
New CVE Received by f4fb688c-4412-4426-b4b8-421ecf27b14a
Jul. 14, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/TYPO3/typo3', 'vendor': 'TYPO3', 'modules': ['Form Framework'], 'product': 'TYPO3 CMS', 'versions': [{'status': 'affected', 'version': '14.2.0', 'lessThan': '14.3.5', 'versionType': 'semver'}], 'packageName': 'typo3/cms-form', 'collectionURL': 'https://packagist.org', 'defaultStatus': 'unaffected'}] Added 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 14.2.0-14.3.5. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/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 Added CWE CWE-351 Added Reference https://typo3.org/security/advisory/typo3-core-sa-2026-020