# CVE-2026-120248: Thelia stored cross-site scripting in store media upload

Source: https://junglewise.ai/threats/cve-2026-120248-thelia-before-3-1-1-contains-a-stored-cross-site-scripting  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-01. Updated: 2026-11-01  
License: CC BY 4.0 with a link back

CVE-2026-120248 · Severity: medium · CVSS 4.8 · Published 2026-11-01

Thelia is an open-source e-commerce platform that manages online stores. An authenticated administrator with store update permissions can upload SVG image files (logos or banners) containing malicious scripts, which are then executed in the browsers of site visitors and other administrators. This allows attackers to steal session tokens, change configurations, or perform unauthorized actions on behalf of victims.

Technologies: [Thelia](https://junglewise.ai/threats/technologies/thelia). Vendors: [Thelia](https://junglewise.ai/threats/vendors/thelia).

## Quick answers

**Is CVE-2026-120248 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120248 being exploited in the wild.

**How severe is CVE-2026-120248?** Medium severity, with a CVSS score of 4.8, published 1 November 2026.

**Which products and versions are affected?** Thelia before 3.1.1.

**Is there a fix for CVE-2026-120248?** Yes: fixed in Thelia 3.1.1. Until then: Restrict store update permissions to trusted administrators only, and avoid uploading SVG images as store logos or banners until upgrading to the patched version. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-120248 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-120248?** Check whether you run Thelia at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Thelia 3.1.1

Restrict store update permissions to trusted administrators only, and avoid uploading SVG images as store logos or banners until upgrading to the patched version.

## Technical details

The vulnerability is a stored XSS flaw in the store configuration controller's media upload handler for logo_file and banner_file parameters. SVG files are not sanitized before being stored and served from /admin/store-media/logo or the public cache/images/store/ directory, allowing embedded JavaScript payloads (such as onload handlers) to execute. Exploitation requires prior authentication with store update permissions.

## Affected products

- Thelia Thelia before 3.1.1

## Timeline

- 2026-11-01: disclosed

## References

- [https://github.com/thelia-templates/default-twig/blob/6473c164bd86348f4c7d0ef6f194f1ff3d267902/src/Controller/Configuration/ConfigStoreController.php](https://github.com/thelia-templates/default-twig/blob/6473c164bd86348f4c7d0ef6f194f1ff3d267902/src/Controller/Configuration/ConfigStoreController.php)
- [https://github.com/thelia-templates/default-twig/commit/d79780eafc5b17ac75554c836a1853610d89a090](https://github.com/thelia-templates/default-twig/commit/d79780eafc5b17ac75554c836a1853610d89a090)

## Related threats

- [Thelia CSRF vulnerability in back office administrative actions](https://junglewise.ai/threats/cve-2026-120206-thelia-before-3-2-0-contains-a-cross-site-request-forgery)
- [Thelia stored cross-site scripting in coupon condition summary](https://junglewise.ai/threats/cve-2026-120205-thelia-before-3-1-0-contains-a-stored-cross-site-scripting)
- [Thelia coupon usage limit bypass](https://junglewise.ai/threats/cve-2026-112285-thelia-before-3-1-5-and-3-2-x-before-3-2-4-contains-a-business)
- [Thelia unrestricted file upload via trailing space bypass](https://junglewise.ai/threats/cve-2026-109397-thelia-before-3-1-2-and-3-2-x-before-3-2-1-contains-an)
- [Thelia CSV formula injection in exports](https://junglewise.ai/threats/cve-2026-109396-thelia-before-3-1-2-and-3-2-x-before-3-2-1-contains-a-csv)