Is CVE-2026-15305 actively exploited?

No active exploitation of CVE-2026-15305 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-15305 be exploited remotely?

Yes. CVE-2026-15305 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-15305?

CVE-2026-15305 has a CVSS score of 6.3 (MEDIUM).

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MEDIUM

CVE-2026-15305

CWE-351Published: July 14, 2026· Updated: Jul 15, 2026

6.3

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-15305 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

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/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