Vulnerability-Lookup

CVE-2026-82396 (GCVE-0-2026-82396)

Vulnerability from cvelistv5 – Published: 2026-08-31 21:23 – Updated: 2026-09-01 14:29

Title

Sulu: Stored XSS via media download inline-disposition override

Summary

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

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 14:28 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/sulu/sulu/security/advisories/…	x_refsource_CONFIRM
https://github.com/sulu/sulu/commit/d061094f5b7bb…	x_refsource_MISC
https://github.com/sulu/sulu/releases/tag/2.6.25	x_refsource_MISC
https://github.com/sulu/sulu/releases/tag/3.0.8	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
sulu	sulu	Affected: < 2.6.25 Affected: >= 3.0.0-alpha1, < 3.0.8	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-82396

Vulnerability from fkie_nvd - Published: 2026-08-31 22:17 - Updated: 2026-09-08 21:11

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/sulu/sulu/commit/d061094f5b7bb1d5e974544fce30bede9c7adf8e
	security-advisories@github.com	https://github.com/sulu/sulu/releases/tag/2.6.25
	security-advisories@github.com	https://github.com/sulu/sulu/releases/tag/3.0.8
	security-advisories@github.com	https://github.com/sulu/sulu/security/advisories/GHSA-pp4x-ccxq-6r33

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
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      "affectedData": [
        {
          "product": "sulu",
          "vendor": "sulu",
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            {
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    }
  ],
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  "lastModified": "2026-09-08T21:11:31.703",
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GHSA-PP4X-CCXQ-6R33

Vulnerability from github – Published: 2026-09-02 15:10 – Updated: 2026-09-02 15:10

Summary

Sulu: Stored XSS via media download inline-disposition override

Details

Impact

Stored Cross Site Scripting (XSS) in the media download endpoint.

The 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.

Every 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.

The 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.

Patches

Fixed 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.

Workarounds

Block 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.

sulu_media:
    upload:
        blocked_file_types: [text/html, application/xhtml+xml, image/svg+xml, text/xml, application/xml, text/javascript, application/javascript]

At 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/*.

Serve uploaded media from a separate origin that does not share the application cookies.

Restrict the media upload permission to trusted users and keep the default SVG sanitizer enabled.

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

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  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.6.24"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "sulu/sulu"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "sulu/sulu"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0-alpha1"
            },
            {
              "fixed": "3.0.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-82396"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-02T15:10:19Z",
    "nvd_published_at": "2026-08-31T22:17:22Z",
    "severity": "MODERATE"
  },
  "details": "### 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.",
  "id": "GHSA-pp4x-ccxq-6r33",
  "modified": "2026-09-02T15:10:19Z",
  "published": "2026-09-02T15:10:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sulu/sulu/security/advisories/GHSA-pp4x-ccxq-6r33"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82396"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sulu/sulu/commit/d061094f5b7bb1d5e974544fce30bede9c7adf8e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sulu/sulu"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sulu/sulu/releases/tag/2.6.25"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sulu/sulu/releases/tag/3.0.8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Sulu: Stored XSS via media download inline-disposition override"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-82396 (GCVE-0-2026-82396)

FKIE_CVE-2026-82396

GHSA-PP4X-CCXQ-6R33

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