{"id":"CVE-2026-45072","aliases":["GHSA-hmr5-2xcr-v8pp"],"url":"https://o3.security/vulnerability/CVE-2026-45072","summary":"Symfony: Stored XSS in WebProfiler CodeExtension::fileExcerpt() — Unescaped Non-PHP File Rendering","details":"### Description\n\nSymfony's profiler, a development only debug UI, renders source-code excerpts on several pages using Twig's custom `file_excerpt` filter. This filter renders PHP files via `highlight_string()` (which escapes HTML), but renders **non-PHP files** by splitting on `\\n` and interpolating each line directly into `<code>{$line}</code>` with no escaping. \n\nAn attacker who can write arbitrary bytes into any file under the project root (including e.g. `var/log/dev.log`), achieves **stored XSS** against any developer who later opens that file in the profiler.\n\n### Resolution\n\nThe `file_excerpt` filter now properly escapes each line of non-PHP files using `htmlspecialchars()` before concatenating them.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/863aa81c61166f1aa74b7732df316f76113acbdb) for branch 6.4.\n\n### Credits\n\nSymfony would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.","published":"2026-07-14T18:11:07.748Z","modified":"2026-08-12T03:51:28.284058978Z","cvss":null,"epss":{"score":0.00232,"percentile":0.14328,"asOf":"2026-08-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"6.4.40"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"7.4.12"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"8.0.12"},{"ecosystem":"Packagist","name":"symfony/twig-bridge","fixedVersion":"6.4.40"},{"ecosystem":"Packagist","name":"symfony/web-profiler-bundle","fixedVersion":"7.4.12"},{"ecosystem":"Packagist","name":"symfony/web-profiler-bundle","fixedVersion":"8.0.12"}],"fix":{"url":"https://github.com/symfony/symfony/commit/863aa81c61166f1aa74b7732df316f76113acbdb","label":"symfony/symfony@863aa81"},"references":[{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v6.4.40"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v7.4.12"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v8.0.12"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45072.json"},{"type":"ADVISORY","url":"https://github.com/symfony/symfony/security/advisories/GHSA-hmr5-2xcr-v8pp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45072"},{"type":"FIX","url":"https://github.com/symfony/symfony/commit/863aa81c61166f1aa74b7732df316f76113acbdb"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45072.yaml"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/twig-bridge/CVE-2026-45072.yaml"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/web-profiler-bundle/CVE-2026-45072.yaml"},{"type":"PACKAGE","url":"https://github.com/symfony/symfony"},{"type":"WEB","url":"https://symfony.com/cve-2026-45072"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.284058978Z"}}