Vulnerability · Published Nov 1, 2026 · Assigned by VulnCheck
CVE-2026-120248Thelia before 3.1.1 Stored XSS via SVG Store Logo and Banner Uploads
Medium 4.8
In plain English
A medium-severity cross-site scripting in Thelia from Thelia. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Official description
Thelia before 3.1.1 contains a stored cross-site scripting vulnerability that allows authenticated back-office administrators with store update permission to inject scripts by uploading unsanitized SVG logo_file or banner_file images. Attackers can upload an SVG with an onload payload served from /admin/store-media/logo or the public cache/images/store/ directory to execute scripts against visitors and higher-privileged administrators.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Thelia | Thelia | 0 – before 3.1.1 |
| Thelia | Thelia Core | 0 – before 3.1.1 |
| Thelia | Thelia Back-office Default Twig Template | 0 – before 1.1.1 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
References
- GitHub Security Advisory (GHSA-gvcv-hvpp-89gx) vendor-advisory
- https://github.com/thelia-templates/default-twig/commit/d79780eafc5b17ac75554c836a1853610d89a090 patch
- https://github.com/thelia-templates/default-twig/commit/f690a649cbbcee9543647cb7ed5018df68f66658 patch
- https://github.com/thelia/thelia/commit/2c691e5c3bb8536ca901fcf7d2780301bd111ba9 patch
- Thelia 3.1.1 Release Notes release-notes
- https://github.com/thelia-templates/default-twig/blob/6473c164bd86348f4c7d0ef6f194f1ff3d267902/src/Controller/Configuration/ConfigStoreController.php#L173-L195 technical-description
- VulnCheck Advisory: Thelia before 3.1.1 Stored XSS via SVG Store Logo and Banner Uploads third-party-advisory