medium6.1
CVE-2026-55877
symfony/ux-icons: XSS via unsanitized SVG content in local files and Iconify on-demand responses
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | symfony/ux-icons | >= 2.17.0, < 2.36.1 | 2.36.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Symfony | Ux | from 2.17.0 before 2.36.1 from 3.0.0 before 3.2.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-6v8j-33hc-mv84
- https://github.com/symfony/ux/security/advisories/GHSA-6v8j-33hc-mv84
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-icons/CVE-2026-55877.yaml
- https://github.com/symfony/ux/commit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1
- https://github.com/symfony/ux/releases/tag/v2.36.1
- https://github.com/symfony/ux/releases/tag/v3.2.0