CVE-2026-55877

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.

PUBLISHED Reserved 2026-06-17 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

References

github.com/...ony/ux/security/advisories/GHSA-6v8j-33hc-mv84

github.com/...ommit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1

github.com/symfony/ux/releases/tag/v2.36.1

github.com/symfony/ux/releases/tag/v3.2.0

cve.org (CVE-2026-55877)

nvd.nist.gov (CVE-2026-55877)

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