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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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