{"id":"CVE-2026-82396","aliases":["EUVD-2026-68891","GHSA-pp4x-ccxq-6r33"],"status":"published","title":"Sulu: Stored XSS via media download inline-disposition override","description":"Sulu is an open-source PHP content management system based on the Symfony framework. Prior to versions 2.6.25 and 3.0.8, src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php allows the /media/{id}/download/{slug} route and its administration variant to honor the inline query parameter for scriptable MIME types. The vulnerable stored Content-Type values include text/html, application/xhtml+xml, text/xml, and application/xml. An attacker with media upload permission can store an HTML, XHTML, or XML document and create a link using inline=1, causing the application to return the file on the Sulu origin instead of forcing Content-Disposition attachment. When an authenticated victim opens the link, attacker-controlled JavaScript can execute with the victim's Sulu-origin session and can read data or perform actions as that victim. This issue is fixed in versions 2.6.25 and 3.0.8.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00298,"percentile":0.22791,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-08-31T21:23:16Z","modified":"2026-10-28T02:30:42Z","fixes":[{"ecosystem":"Packagist","package":"sulu/sulu","fixed_in":["2.6.25","3.0.8"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"sulu/sulu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.6.24"},{"fixed":"2.6.25"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"sulu/sulu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0-alpha1"},{"fixed":"3.0.8"}]}]},{"source":"osv","ecosystem":"Packagist","package":"sulu/sulu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.25"}]}],"versions":["0.1.0","0.1.1","0.10.0","0.10.1","0.10.2","0.11.0","0.11.1","0.11.2","0.12.0","0.13.0","0.13.1","0.13.2","0.14.0","0.14.1","0.14.2","0.15.0","0.15.1","0.15.2","0.15.3","0.16.0","0.16.1","0.16.2","0.17.0","0.17.0-RC1","0.17.0-RC2","0.18.0","0.18.1","0.18.2","0.2.0","0.3.0","0.4.0","0.5.0","0.6.0","0.6.1","0.6.2","0.6.3","0.6.4","0.6.5","0.6.6","0.6.7","0.6.8","0.7.0","0.7.1","0.8.0","0.8.1","0.8.2","0.8.3","0.8.4","0.8.5","0.8.6","0.9.0","1.0.0","1.0.0-RC1","1.0.0-RC2","1.0.0-RC3","1.0.1","1.0.10","1.0.11","1.0.12","1.0.13","1.0.14","1.0.15","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.8","1.0.9","1.1.0","1.1.0-RC1","1.1.0-RC2","1.1.0-beta1","1.1.1","1.1.10","1.1.11","1.1.12","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.1.8","1.1.9","1.2.0","1.2.0-RC1","1.2.0-RC2","1.2.0-RC3","1.2.0-RC4","1.2.1","1.2.2","1.2.3","1.2.4","1.2.5","1.2.6","1.2.7","1.2.8","1.2.9","1.3.0","1.3.0-RC1","1.3.0-RC2","1.3.0-RC3","1.3.1","1.3.10","1.3.11","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","1.3.8","1.3.9","1.4.0","1.4.0-RC1","1.4.0-RC2","1.4.1","1.4.10","1.4.11","1.4.12","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.4.8","1.4.9","1.5.0","1.5.0-RC1","1.5.0-RC2","1.5.0-RC3","1.5.1","1.5.10","1.5.11","1.5.12","1.5.13","1.5.14","1.5.15","1.5.16","1.5.17","1.5.18","1.5.19","1.5.2","1.5.20","1.5.21","1.5.22","1.5.23","1.5.24","1.5.3","1.5.4","1.5.5","1.5.6","1.5.7","1.5.8","1.5.9","1.6.0","1.6.0-RC1","1.6.1","1.6.10","1.6.11","1.6.12","1.6.13","1.6.14","1.6.15","1.6.16","1.6.17","1.6.18","1.6.19","1.6.2","1.6.20","1.6.21","1.6.22","1.6.23","1.6.24","1.6.25","1.6.26","1.6.27","1.6.28","1.6.29","1.6.3","1.6.30","1.6.31","1.6.32","1.6.33","1.6.34","1.6.35","1.6.36","1.6.37","1.6.38","1.6.39","1.6.4","1.6.40","1.6.41","1.6.42","1.6.43","1.6.44","1.6.45","1.6.46","1.6.5","1.6.6","1.6.7","1.6.8","1.6.9","2.0.0","2.0.0-RC1","2.0.0-RC2","2.0.0-RC3","2.0.0-alpha1","2.0.0-alpha2","2.0.0-alpha3","2.0.0-alpha4","2.0.0-alpha5","2.0.0-alpha6","2.0.1","2.0.10","2.0.11","2.0.12","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1.0","2.1.0-RC1","2.1.0-RC2","2.1.1","2.1.10","2.1.11","2.1.12","2.1.13","2.1.14","2.1.2","2.1.3","2.1.4","2.1.5","2.1.6","2.1.7","2.1.8","2.1.9","2.2.0","2.2.0-RC1","2.2.1","2.2.10","2.2.11","2.2.12","2.2.13","2.2.14","2.2.15","2.2.16","2.2.17","2.2.18","2.2.19","2.2.2","2.2.3","2.2.4","2.2.5","2.2.6","2.2.7","2.2.8","2.2.9","2.3.0","2.3.0-RC1","2.3.0-RC2","2.3.1","2.3.10","2.3.11","2.3.12","2.3.13","2.3.2","2.3.3","2.3.4","2.3.5","2.3.6","2.3.7","2.3.8","2.3.9","2.4.0","2.4.0-RC1","2.4.1","2.4.10","2.4.11","2.4.12","2.4.13","2.4.14","2.4.15","2.4.16","2.4.17","2.4.18","2.4.19","2.4.2","2.4.20","2.4.3","2.4.4","2.4.5","2.4.6","2.4.7","2.4.8","2.4.9","2.5.0","2.5.0-alpha1","2.5.1","2.5.10","2.5.11","2.5.12","2.5.13","2.5.14","2.5.15","2.5.16","2.5.17","2.5.18","2.5.19","2.5.2","2.5.20","2.5.21","2.5.22","2.5.23","2.5.24","2.5.25","2.5.26","2.5.27","2.5.28","2.5.29","2.5.3","2.5.30","2.5.31","2.5.32","2.5.33","2.5.4","2.5.5","2.5.6","2.5.7","2.5.8","2.5.9","2.6.0","2.6.0-RC1","2.6.0-RC2","2.6.1","2.6.10","2.6.11","2.6.12","2.6.13","2.6.14","2.6.15","2.6.16","2.6.17","2.6.18","2.6.19","2.6.2","2.6.20","2.6.21","2.6.22","2.6.23","2.6.24","2.6.3","2.6.4","2.6.5","2.6.6","2.6.7","2.6.8","2.6.9"]},{"source":"osv","ecosystem":"Packagist","package":"sulu/sulu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0-alpha1"},{"fixed":"3.0.8"}]}],"versions":["3.0.0","3.0.0-RC1","3.0.0-RC2","3.0.0-alpha1","3.0.0-alpha2","3.0.0-alpha3","3.0.0-alpha4","3.0.0-alpha5","3.0.0-beta1","3.0.0-beta2","3.0.0-beta3","3.0.0-beta4","3.0.1","3.0.2","3.0.3","3.0.4","3.0.5","3.0.6","3.0.7"]}],"products":[{"vendor":"sulu","product":"sulu"}],"references":[{"url":"https://github.com/sulu/sulu/security/advisories/GHSA-pp4x-ccxq-6r33","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/sulu/sulu/commit/d061094f5b7bb1d5e974544fce30bede9c7adf8e","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/sulu/sulu/releases/tag/2.6.25","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/sulu/sulu/releases/tag/3.0.8","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82396","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-pp4x-ccxq-6r33"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82396.json","tags":["advisory"]},{"url":"https://github.com/sulu/sulu","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-82396","title":"Sulu: Stored XSS via media download inline-disposition override","description":"Sulu is an open-source PHP content management system based on the Symfony framework. Prior to versions 2.6.25 and 3.0.8, src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php allows the /media/{id}/download/{slug} route and its administration variant to honor the inline query parameter for scriptable MIME types. The vulnerable stored Content-Type values include text/html, application/xhtml+xml, text/xml, and application/xml. An attacker with media upload permission can store an HTML, XHTML, or XML document and create a link using inline=1, causing the application to return the file on the Sulu origin instead of forcing Content-Disposition attachment. When an authenticated victim opens the link, attacker-controlled JavaScript can execute with the victim's Sulu-origin session and can read data or perform actions as that victim. This issue is fixed in versions 2.6.25 and 3.0.8.","status":"published","published":"2026-08-31T21:23:16.852Z","modified":"2026-09-01T14:29:00.823Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:40:46.161838Z"}],"euvd":[{"id":"EUVD-2026-68891","description":"Sulu is an open-source PHP content management system based on the Symfony framework. Prior to versions 2.6.25 and 3.0.8, src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php allows the /media/{id}/download/{slug} route and its administration variant to honor the inline query parameter for scriptable MIME types. The vulnerable stored Content-Type values include text/html, application/xhtml+xml, text/xml, and application/xml. An attacker with media upload permission can store an HTML, XHTML, or XML document and create a link using inline=1, causing the application to return the file on the Sulu origin instead of forcing Content-Disposition attachment. When an authenticated victim opens the link, attacker-controlled JavaScript can execute with the victim's Sulu-origin session and can read data or perform actions as that victim. This issue is fixed in versions 2.6.25 and 3.0.8.","status":"published","published":"2026-08-31T21:23:16Z","modified":"2026-09-01T14:29:00Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T18:01:18.264709Z"}],"ghsa":[{"id":"GHSA-pp4x-ccxq-6r33","title":"Sulu: Stored XSS via media download inline-disposition override","description":"### Impact\n\nStored Cross Site Scripting (XSS) in the media download endpoint.\n\nThe download route (`/media/{id}/download/{slug}` and its admin variant) accepts the query parameter `?inline=1`. When it is present, the response is sent with the header `Content-Disposition: inline` for any MIME type, which overrides the disposition rules the server would otherwise apply. By default, HTML and other scriptable uploads are not blocked, the file is served on the application origin with its stored `Content-Type`, and no `X-Content-Type-Options` or `Content-Security-Policy` header is sent. Because of this, an attacker can upload an HTML file and build a link that runs their own JavaScript in the context of the Sulu origin.\n\nEvery installation where users who are not fully trusted can upload media is affected. This includes editors who hold the media add permission. Such an editor can store a payload that runs in the authenticated session of anyone who opens the link, including an administrator, which allows theft of the session and credentials and lets the attacker act as the victim.\n\nThe problem is present on the 2.6 and 3.0 branches and goes back to the introduction of the `?inline` override in 2017. It is not the same as CVE-2024-47617, which was a reflected XSS through the `slug` and is already fixed.\n\n### Patches\n\nFixed in **2.6.25** and **3.0.8**. The download route now forces `Content-Disposition: attachment` for MIME types a browser renders as a document (`text/html`, `application/xhtml+xml`, `text/xml`, `application/xml`), even when `?inline=1` is requested. Inline viewing is unchanged for safe types such as PDF and images.\n\n### Workarounds\n\nBlock scriptable uploads by MIME type through `sulu_media.upload.blocked_file_types`. This stops new uploads only, so existing media has to be reviewed separately.\n\n```yaml\nsulu_media:\n    upload:\n        blocked_file_types: [text/html, application/xhtml+xml, image/svg+xml, text/xml, application/xml, text/javascript, application/javascript]\n```\n\nAt the web server or reverse proxy, force `Content-Disposition: attachment` and add `X-Content-Type-Options: nosniff` and a restrictive `Content-Security-Policy` on the paths `/media/*/download/*` and `/admin/media/*/download/*`.\n\nServe uploaded media from a separate origin that does not share the application cookies.\n\nRestrict the media upload permission to trusted users and keep the default SVG sanitizer enabled.","status":"published","published":"2026-09-02T15:10:19Z","modified":"2026-09-02T15:10:21Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:41:10.121131Z"}],"nvd":[{"id":"CVE-2026-82396","description":"Sulu is an open-source PHP content management system based on the Symfony framework. Prior to versions 2.6.25 and 3.0.8, src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php allows the /media/{id}/download/{slug} route and its administration variant to honor the inline query parameter for scriptable MIME types. The vulnerable stored Content-Type values include text/html, application/xhtml+xml, text/xml, and application/xml. An attacker with media upload permission can store an HTML, XHTML, or XML document and create a link using inline=1, causing the application to return the file on the Sulu origin instead of forcing Content-Disposition attachment. When an authenticated victim opens the link, attacker-controlled JavaScript can execute with the victim's Sulu-origin session and can read data or perform actions as that victim. This issue is fixed in versions 2.6.25 and 3.0.8.","status":"published","published":"2026-08-31T22:17:22.78Z","modified":"2026-09-08T21:11:31.703Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:42.691315Z"}],"osv":[{"id":"CVE-2026-82396","title":"Sulu: Stored XSS via media download inline-disposition override","description":"Sulu is an open-source PHP content management system based on the Symfony framework. Prior to versions 2.6.25 and 3.0.8, src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php allows the /media/{id}/download/{slug} route and its administration variant to honor the inline query parameter for scriptable MIME types. The vulnerable stored Content-Type values include text/html, application/xhtml+xml, text/xml, and application/xml. An attacker with media upload permission can store an HTML, XHTML, or XML document and create a link using inline=1, causing the application to return the file on the Sulu origin instead of forcing Content-Disposition attachment. When an authenticated victim opens the link, attacker-controlled JavaScript can execute with the victim's Sulu-origin session and can read data or perform actions as that victim. This issue is fixed in versions 2.6.25 and 3.0.8.","status":"published","published":"2026-08-31T21:23:16.852Z","modified":"2026-10-28T02:30:42.354488857Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:18.131258Z"},{"id":"GHSA-pp4x-ccxq-6r33","title":"Sulu: Stored XSS via media download inline-disposition override","description":"### Impact\n\nStored Cross Site Scripting (XSS) in the media download endpoint.\n\nThe download route (`/media/{id}/download/{slug}` and its admin variant) accepts the query parameter `?inline=1`. When it is present, the response is sent with the header `Content-Disposition: inline` for any MIME type, which overrides the disposition rules the server would otherwise apply. By default, HTML and other scriptable uploads are not blocked, the file is served on the application origin with its stored `Content-Type`, and no `X-Content-Type-Options` or `Content-Security-Policy` header is sent. Because of this, an attacker can upload an HTML file and build a link that runs their own JavaScript in the context of the Sulu origin.\n\nEvery installation where users who are not fully trusted can upload media is affected. This includes editors who hold the media add permission. Such an editor can store a payload that runs in the authenticated session of anyone who opens the link, including an administrator, which allows theft of the session and credentials and lets the attacker act as the victim.\n\nThe problem is present on the 2.6 and 3.0 branches and goes back to the introduction of the `?inline` override in 2017. It is not the same as CVE-2024-47617, which was a reflected XSS through the `slug` and is already fixed.\n\n### Patches\n\nFixed in **2.6.25** and **3.0.8**. The download route now forces `Content-Disposition: attachment` for MIME types a browser renders as a document (`text/html`, `application/xhtml+xml`, `text/xml`, `application/xml`), even when `?inline=1` is requested. Inline viewing is unchanged for safe types such as PDF and images.\n\n### Workarounds\n\nBlock scriptable uploads by MIME type through `sulu_media.upload.blocked_file_types`. This stops new uploads only, so existing media has to be reviewed separately.\n\n```yaml\nsulu_media:\n    upload:\n        blocked_file_types: [text/html, application/xhtml+xml, image/svg+xml, text/xml, application/xml, text/javascript, application/javascript]\n```\n\nAt the web server or reverse proxy, force `Content-Disposition: attachment` and add `X-Content-Type-Options: nosniff` and a restrictive `Content-Security-Policy` on the paths `/media/*/download/*` and `/admin/media/*/download/*`.\n\nServe uploaded media from a separate origin that does not share the application cookies.\n\nRestrict the media upload permission to trusted users and keep the default SVG sanitizer enabled.","status":"published","published":"2026-09-02T15:10:19Z","modified":"2026-09-02T15:15:09.414579873Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:53.244788Z"}]}}