Vulnerability-Lookup

GHSA-8559-GWJ3-Q37R

Vulnerability from github – Published: 2026-07-14 19:51 – Updated: 2026-07-14 19:51

Summary

EasyAdmin: Stored Cross-Site Scripting (XSS) via uploaded files served inline in FileField and ImageField

Details

EasyAdmin's FileField and ImageField accept browser-executable file types by default (FileField applies no MIME/extension restrictions; ImageField's default Image constraint accepts SVG). When the upload directory is configured inside the public web root — as shown in the documentation — EasyAdmin links to the stored file inline (no download attribute or Content-Disposition: attachment).

An attacker with access to a form using these fields can upload an .html (FileField) or .svg (ImageField) file containing JavaScript. When another user opens it from the backend, it is served from the same origin and the script executes in the context of their authenticated admin session, enabling session/CSRF-token theft or privilege escalation.

Exploitation requires the developer to store uploads in the public directory and a privilege gap between the uploading user and the viewing administrator. This is stored XSS only — it does not allow remote code execution, because uploaded filenames are derived from Symfony's guessExtension(), which never produces .php/.phtml.

Credit

We would like to thank Emre Dogan for reporting the issue.

Severity

7.6 (High)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "easycorp/easyadmin-bundle"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54087"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-14T19:51:34Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "EasyAdmin\u0027s `FileField` and `ImageField` accept browser-executable file types by default (`FileField` applies no MIME/extension restrictions; `ImageField`\u0027s default `Image` constraint accepts SVG). When the upload directory is configured inside the public web root \u2014 as shown in the documentation \u2014 EasyAdmin links to the stored file inline (no download attribute or `Content-Disposition: attachment`).\n\nAn attacker with access to a form using these fields can upload an `.html` (`FileField`) or `.svg` (`ImageField`) file containing JavaScript. When another  user opens it from the backend, it is served from the same origin and the script executes in the context of their authenticated admin session, enabling session/CSRF-token theft or privilege escalation.\n\nExploitation requires the developer to store uploads in the public directory and a privilege gap between the uploading user and the viewing administrator. This is stored XSS only \u2014 it does not allow remote code execution, because uploaded filenames are derived from Symfony\u0027s `guessExtension()`, which never produces `.php`/`.phtml`.\n\nCredit\n\nWe would like to thank Emre Dogan for reporting the issue.",
  "id": "GHSA-8559-gwj3-q37r",
  "modified": "2026-07-14T19:51:35Z",
  "published": "2026-07-14T19:51:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/EasyCorp/EasyAdminBundle/security/advisories/GHSA-8559-gwj3-q37r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/EasyCorp/EasyAdminBundle/commit/8132b2b0ca3876c9261264fa267106a1b2c10a68"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/EasyCorp/EasyAdminBundle"
    },
    {
      "type": "WEB",
      "url": "https://github.com/EasyCorp/EasyAdminBundle/releases/tag/v5.0.13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "EasyAdmin: Stored Cross-Site Scripting (XSS) via uploaded files served inline in FileField and ImageField"
}

CVE-2026-54087 (GCVE-0-2026-54087)

Vulnerability from cvelistv5 – Published: 2026-09-14 17:13 – Updated: 2026-09-14 19:00

Title

EasyAdmin: Stored Cross-Site Scripting (XSS) via uploaded files served inline in FileField and ImageField

Summary

EasyAdmin is a fast and modern admin generator for Symfony applications. From 5.0.0 until 5.0.13, FileField and ImageField can accept browser-executable uploads while templates/crud/field/file.html.twig links to stored files for inline same-origin rendering without a download attribute or Content-Disposition attachment header. When uploads are stored under the public web root, an attacker with access to an affected form can upload HTML through FileField or SVG through ImageField, and JavaScript executes in an authenticated administrator's origin when the file is opened from the backend. Exploitation requires a privilege gap between the uploader and viewer. The issue can expose session or CSRF tokens and enable privilege escalation, but does not permit PHP or PHTML code execution because Symfony guessExtension does not produce those stored extensions. This issue is fixed in version 5.0.13.

Severity

7.6 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 19:00 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7831 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/EasyCorp/EasyAdminBundle/secur…	x_refsource_CONFIRM
https://github.com/EasyCorp/EasyAdminBundle/commi…	x_refsource_MISC
https://github.com/EasyCorp/EasyAdminBundle/relea…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
EasyCorp	EasyAdminBundle	Affected: >= 5.0.0, < 5.0.13

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54087",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-14T19:00:05.983563Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-14T19:00:23.879Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "EasyAdminBundle",
          "vendor": "EasyCorp",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 5.0.13"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "EasyAdmin is a fast and modern admin generator for Symfony applications. From 5.0.0 until 5.0.13, FileField and ImageField can accept browser-executable uploads while templates/crud/field/file.html.twig links to stored files for inline same-origin rendering without a download attribute or Content-Disposition attachment header. When uploads are stored under the public web root, an attacker with access to an affected form can upload HTML through FileField or SVG through ImageField, and JavaScript executes in an authenticated administrator\u0027s origin when the file is opened from the backend. Exploitation requires a privilege gap between the uploader and viewer. The issue can expose session or CSRF tokens and enable privilege escalation, but does not permit PHP or PHTML code execution because Symfony guessExtension does not produce those stored extensions. This issue is fixed in version 5.0.13."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-434",
              "description": "CWE-434: Unrestricted Upload of File with Dangerous Type",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T17:13:25.230Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/EasyCorp/EasyAdminBundle/security/advisories/GHSA-8559-gwj3-q37r",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/EasyCorp/EasyAdminBundle/security/advisories/GHSA-8559-gwj3-q37r"
        },
        {
          "name": "https://github.com/EasyCorp/EasyAdminBundle/commit/8132b2b0ca3876c9261264fa267106a1b2c10a68",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/EasyCorp/EasyAdminBundle/commit/8132b2b0ca3876c9261264fa267106a1b2c10a68"
        },
        {
          "name": "https://github.com/EasyCorp/EasyAdminBundle/releases/tag/v5.0.13",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/EasyCorp/EasyAdminBundle/releases/tag/v5.0.13"
        }
      ],
      "source": {
        "advisory": "GHSA-8559-gwj3-q37r",
        "discovery": "UNKNOWN"
      },
      "title": "EasyAdmin: Stored Cross-Site Scripting (XSS) via uploaded files served inline in FileField and ImageField"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54087",
    "datePublished": "2026-09-14T17:13:25.230Z",
    "dateReserved": "2026-06-11T18:44:47.761Z",
    "dateUpdated": "2026-09-14T19:00:23.879Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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