---
id: CVE-2026-103522
title: >-
  In Thelia v2.6.0, the store banner upload feature performs insufficient
  filetype validation that relies exclusively on client‑supplied MIME types
summary: >-
  In Thelia v2.6.0, the store banner upload feature performs insufficient
  filetype validation that relies exclusively on client‑supplied MIME types. An
  attacker with administrative access can upload a PHP file disguised as an
  image to bypa…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-434
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T15:17:05.690'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103522'
references:
  - url: 'https://kb.cert.org/vuls/id/162329'
    label: cret@cert.org
tags:
  - nvd
ingestedAt: '2026-10-12T15:55:08.153Z'
---

## Overview

In Thelia v2.6.0, the store banner upload feature performs insufficient filetype validation that relies exclusively on client‑supplied MIME types. An attacker with administrative access can upload a PHP file disguised as an image to bypass validation and achieve remote code execution on the underlying server.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.