Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Symfony | Ux | >= 2.17.0, < 2.36.1 |
Related Weaknesses (CWE)
References
- https://github.com/symfony/ux/commit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1Patch
- https://github.com/symfony/ux/releases/tag/v2.36.1Release Notes
- https://github.com/symfony/ux/releases/tag/v3.2.0Release Notes
- https://github.com/symfony/ux/security/advisories/GHSA-6v8j-33hc-mv84Vendor Advisory
FAQ
What is CVE-2026-55877?
CVE-2026-55877 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 ve...
How severe is CVE-2026-55877?
CVE-2026-55877 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55877?
Check the references section above for vendor advisories and patch information. Affected products include: Symfony Ux.