{"id":"GHSA-mwqm-4fw3-cjvr","summary":"symfony/ux-autocomplete: XSS via unescaped AJAX response data","details":"### Description\n\nThe Stimulus controller shipped with `symfony/ux-autocomplete` renders AJAX response items into the dropdown by interpolating the `text` field directly into HTML template literals (`\u003cdiv\u003e${item[labelField]}\u003c/div\u003e`) inside `_createAutocompleteWithRemoteData()`. The value is parsed as HTML rather than text, so any markup contained in the AJAX response is executed by the browser.\n\nWhen the dropdown values are derived from user-supplied content, an attacker can craft a string that triggers stored XSS in the browser of any other user who later opens a page containing an autocomplete widget backed by the same data.\n\n### Resolution\n\nThe `option` and `item` renderers used in `_createAutocompleteWithRemoteData()` now use TomSelect's `escape` helper to HTML-escape the value by default. Endpoints that legitimately return HTML (for example, to highlight the search term) can opt back in to the previous behavior by setting `options_as_html: true`. The `AutocompleteChoiceTypeExtension` normalizer that previously forced `options_as_html=false` when `autocomplete_url` was set has been dropped so the opt-in is reachable from the form layer.\n\nThe patch for this issue is available [here](https://github.com/symfony/ux/commit/842ae54bc74de389299f975f01aafae272cb0019) for branch 2.x (and forward-ported to 3.x).\n\n### Credits\n\nSymfony would like to thank Alex Ashkov for reporting the issue and Hugo Alliaume for providing the fix.","aliases":["CVE-2026-49216"],"modified":"2026-09-10T03:51:09.172263351Z","published":"2026-06-19T19:35:05Z","database_specific":{"github_reviewed_at":"2026-06-19T19:35:05Z","nvd_published_at":null,"cwe_ids":["CWE-79"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/symfony/ux/security/advisories/GHSA-mwqm-4fw3-cjvr"},{"type":"WEB","url":"https://github.com/symfony/ux/commit/842ae54bc74de389299f975f01aafae272cb0019"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-autocomplete/CVE-2026-49216.yaml"},{"type":"PACKAGE","url":"https://github.com/symfony/ux"}],"affected":[{"package":{"name":"symfony/ux-autocomplete","ecosystem":"Packagist","purl":"pkg:composer/symfony/ux-autocomplete"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2.0"},{"fixed":"2.36.0"}]}],"versions":["v2.10.0","v2.11.0","v2.11.1","v2.11.2","v2.12.0","v2.13.0","v2.13.1","v2.13.2","v2.13.3","v2.14.0","v2.14.2","v2.15.0","v2.16.0","v2.17.0","v2.18.0","v2.19.0","v2.19.2","v2.2.0","v2.20.0","v2.21.0","v2.22.0","v2.22.1","v2.23.0","v2.24.0","v2.25.0","v2.25.1","v2.25.2","v2.26.0","v2.26.1","v2.27.0","v2.28.0","v2.28.1","v2.28.2","v2.29.0","v2.29.1","v2.29.2","v2.3.0","v2.30.0","v2.31.0","v2.32.0","v2.33.0","v2.34.0","v2.35.0","v2.4.0","v2.5.0","v2.6.0","v2.6.1","v2.7.0","v2.7.1","v2.8.0","v2.8.1","v2.9.0","v2.9.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mwqm-4fw3-cjvr/GHSA-mwqm-4fw3-cjvr.json"}},{"package":{"name":"symfony/ux-autocomplete","ecosystem":"Packagist","purl":"pkg:composer/symfony/ux-autocomplete"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.1.0"}]}],"versions":["v3.0.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mwqm-4fw3-cjvr/GHSA-mwqm-4fw3-cjvr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}