CVE-2026-55877
Medium
Description
Symfony UX is a JavaScript ecosystem for Symfony. From 2.17.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux_icon() Twig function is marked is_safe=['html'] and Icon::toHtml() inlines SVG source verbatim, allowing unsanitized local SVG files or Iconify on-demand JSON body responses containing nested script elements, on* event handlers, or dangerous URL schemes to execute cross-site scripting. This issue is fixed in versions 2.36.1 and 3.2.0.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Symfony Ux
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- symfony ux2.36.1, 3.2.0 or later
- symfony/ux-icons2.36.1, 3.2.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| symfony ux | 2.17.0 ≤ v < 2.36.1, 3.0.0 ≤ v < 3.2.0 | 2.36.1, 3.2.0 |
| symfony/ux-iconsPackagist | 2.17.0 ≤ v < 2.36.1, 3.0.0 ≤ v < 3.2.0 | 2.36.1, 3.2.0 |
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