XSS in Thelia
CVE-2026-120248
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/thelia/thelia/security/advisories/GHSA-gvcv-hvpp-89gx (vendor-advisory)
- github.com/thelia-templates/default-twig/commit/d79780eafc5b17ac75554c836a18536… (patch)
- github.com/thelia-templates/default-twig/commit/f690a649cbbcee9543647cb7ed5018d… (patch)
- github.com/thelia/thelia/commit/2c691e5c3bb8536ca901fcf7d2780301bd111ba9 (patch)
- github.com/thelia/thelia/releases/tag/3.1.1 (release-notes)
- github.com/thelia-templates/default-twig/blob/6473c164bd86348f4c7d0ef6f194f1ff3… (technical-description)
- www.vulncheck.com/advisories/thelia-before-3.1.1-stored-xss-via-svg-store-logo-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-120248?
- CVE-2026-120248 is a medium-severity vulnerability in Thelia, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-11-01.
- How severe is CVE-2026-120248?
- Medium severity. CVSS v3 base score is 4.8 out of 10.