medium5.4
CVE-2026-49216
symfony/ux-autocomplete: XSS via unescaped AJAX response data
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | symfony/ux-autocomplete | >= 2.2.0, < 2.36.0 | 2.36.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Symfony | Ux | from 2.2.0 before 2.36.0 Version 3.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-mwqm-4fw3-cjvr
- https://github.com/symfony/ux/security/advisories/GHSA-mwqm-4fw3-cjvr
- https://github.com/symfony/ux/commit/842ae54bc74de389299f975f01aafae272cb0019
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-autocomplete/CVE-2026-49216.yaml
- https://github.com/symfony/ux/releases/tag/v2.36.0
- https://github.com/symfony/ux/releases/tag/v3.1.0