CVE-2026-55877CWE-79cross-site-scripting

CVE-2026-55877

Medium · published July 9, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
26.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00338 · 26.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-09T02:17Z
Affected products (2)
ProductVersionsFixed in
symfony/ux≥ 2.17.0, < 2.36.12.36.1
symfony/ux≥ 3.0.0, < 3.2.03.2.0
References (4)
https://github.com/symfony/ux/commit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1 · [email protected]https://github.com/symfony/ux/releases/tag/v2.36.1 · [email protected]https://github.com/symfony/ux/releases/tag/v3.2.0 · [email protected]https://github.com/symfony/ux/security/advisories/GHSA-6v8j-33hc-mv84 · [email protected]
EPSS history
Timeline
  • 08 JUL 21:32Z
    Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses
    cvelistv5