Contao before 5.5.6 allows XSS via an SVG document. This affects (in contao/core-bundle in Composer) 4.x before 4.13.54, 5.0.x through 5.3.x before 5.3.30, and 5.4.x and 5.5..x before 5.5.6.
https://grimthereaperteam.medium.com/contao-5-4-1-malicious-file-upload-xss-in-svg-30edb8820ecb
https://contao.org/en/security-advisories/cross-site-scripting-through-svg-uploads
Published: 2024-10-02
Updated: 2025-03-24
Base Score: 5.5
Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N
Severity: Medium
Base Score: 4.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Severity: Medium
Base Score: 1.8
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Severity: Low