{
"id": "GHSA-hmr5-2xcr-v8pp",
"aliases": [
"CVE-2026-45072"
],
"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.",
"summary": "Symfony Vulnerable to stored XSS in WebProfiler CodeExtension::fileExcerpt() — Unescaped Non-PHP File Rendering",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.4.24"
},
{
"fixed": "6.4.40"
}
]
}
],
"package": {
"name": "symfony/symfony",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "7.2.9"
},
{
"fixed": "7.4.12"
}
]
}
],
"package": {
"name": "symfony/symfony",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.0.12"
}
]
}
],
"package": {
"name": "symfony/symfony",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.4.24"
},
{
"fixed": "6.4.40"
}
]
}
],
"package": {
"name": "symfony/twig-bridge",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "7.2.9"
},
{
"fixed": "7.4.12"
}
]
}
],
"package": {
"name": "symfony/web-profiler-bundle",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.0.12"
}
]
}
],
"package": {
"name": "symfony/web-profiler-bundle",
"ecosystem": "Packagist"
}
}
],
"modified": "2026-05-27T21:10:44Z",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U"
}
],
"published": "2026-05-27T21:10:44Z",
"references": [
{
"url": "https://github.com/symfony/symfony/security/advisories/GHSA-hmr5-2xcr-v8pp",
"type": "WEB"
},
{
"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": "WEB"
},
{
"url": "https://github.com/symfony/symfony",
"type": "PACKAGE"
},
{
"url": "https://symfony.com/cve-2026-45072",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"severity": "LOW",
"github_reviewed": true,
"nvd_published_at": null,
"github_reviewed_at": "2026-05-27T21:10:44Z"
}
}