---
id: CVE-2026-120248
title: Thelia before 3.1.1 Stored XSS via SVG Store Logo and Banner Uploads
summary: >-
  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. At…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: Thelia
product: Thelia
affected:
  - Thelia < 3.1.1
  - core < 3.1.1
  - back-office_default_twig_template < 1.1.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-02T17:04:06.359779Z'
published: '2026-11-01'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T21:04:42.244Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120248'
references:
  - url: 'https://github.com/thelia/thelia/security/advisories/GHSA-gvcv-hvpp-89gx'
    label: GitHub Security Advisory (GHSA-gvcv-hvpp-89gx)
  - url: >-
      https://github.com/thelia-templates/default-twig/commit/d79780eafc5b17ac75554c836a1853610d89a090
  - url: >-
      https://github.com/thelia-templates/default-twig/commit/f690a649cbbcee9543647cb7ed5018df68f66658
  - url: >-
      https://github.com/thelia/thelia/commit/2c691e5c3bb8536ca901fcf7d2780301bd111ba9
  - url: 'https://github.com/thelia/thelia/releases/tag/3.1.1'
    label: Thelia 3.1.1 Release Notes
  - url: >-
      https://github.com/thelia-templates/default-twig/blob/6473c164bd86348f4c7d0ef6f194f1ff3d267902/src/Controller/Configuration/ConfigStoreController.php#L173-L195
  - url: >-
      https://www.vulncheck.com/advisories/thelia-before-3.1.1-stored-xss-via-svg-store-logo-and-banner-uploads
    label: >-
      VulnCheck Advisory: Thelia before 3.1.1 Stored XSS via SVG Store Logo and
      Banner Uploads
tags:
  - cve.org
epss: 0.00239
epssPercentile: 0.15058
ingestedAt: '2026-11-05T19:30:42.854Z'
---

## Overview

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

- `Thelia < 3.1.1`
- `core < 3.1.1`
- `back-office_default_twig_template < 1.1.1`

## Remediation

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