CVE-2026-49216CWE-79

Symfony UX: XSS in symfony/ux-autocomplete via unescaped AJAX response data

Medium · published July 17, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
22.8
In the wild
Unconfirmed
What it is

Symfony UX is a JavaScript ecosystem for Symfony. From 2.2.0 until 2.36.0 and 3.1.0, the Stimulus controller in symfony/ux-autocomplete renders AJAX response items in _createAutocompleteWithRemoteData() by interpolating the text field into HTML template literals (<div>${item[labelField]}</div>) rather than text, allowing attacker-controlled markup from user-supplied dropdown values to execute in the browser of any user who opens an autocomplete widget backed by the same data. This issue is fixed in versions 2.36.0 and 3.1.0.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00312 · 22.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-17T16:15Z
EPSS history
Timeline
  • 17 JUL 16:15Z
    Symfony UX: XSS in symfony/ux-autocomplete via unescaped AJAX response data
    cvelistv5