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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                "id": "CVE-2026-82396",
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                  },
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                "timestamp": "2026-09-01T14:28:25.862691Z",
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        }
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      "title": "Sulu: Stored XSS via media download inline-disposition override"
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FKIE_CVE-2026-82396

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

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

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "sulu",
          "vendor": "sulu",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.6.25"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.0.0-alpha1, \u003c 3.0.8"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s 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."
    }
  ],
  "id": "CVE-2026-82396",
  "lastModified": "2026-08-31T22:17:22.780",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
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        "impactScore": 2.7,
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        "type": "Secondary"
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  "published": "2026-08-31T22:17:22.780",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sulu/sulu/commit/d061094f5b7bb1d5e974544fce30bede9c7adf8e"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sulu/sulu/releases/tag/2.6.25"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sulu/sulu/releases/tag/3.0.8"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sulu/sulu/security/advisories/GHSA-pp4x-ccxq-6r33"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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.

Action not permitted

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

FKIE_CVE-2026-82396

Tags

Sightings

Nomenclature