Vulnerability-Lookup

GHSA-MFQJ-CQV3-H7XW

Vulnerability from github – Published: 2026-08-31 19:53 – Updated: 2026-08-31 19:53

Summary

TYPO3 CMS - Unrestricted File Upload in Form Framework

Details

Problem

Users were able to upload files with arbitrary MIME types to forms using FileUpload or ImageUpload elements with allowedMimeTypes configured - uploading PHP files was not possible. The restriction was not enforced server-side because the MimeTypeValidator was registered during form building before concrete form definition properties were applied, resulting in the validator never being added to the processing pipeline.

Solution

Update to TYPO3 version 14.3.5 LTS that fixes the problem described.

Credits

Thanks to Sébastien Convers for reporting this issue, and to Josua Vogel and Oliver Hader for fixing it.

Severity

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 14.3.4"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "typo3/cms-form"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "14.2.0"
            },
            {
              "fixed": "14.3.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-15305"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-351"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-31T19:53:59Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Problem\nUsers were able to upload files with arbitrary MIME types to forms using _FileUpload_ or _ImageUpload_ elements with _allowedMimeTypes_ configured - uploading PHP files was **not** possible. The restriction was not enforced server-side because the _MimeTypeValidator_ was registered during form building before concrete form definition properties were applied, resulting in the validator never being added to the processing pipeline.\n\n### Solution\nUpdate to TYPO3 version 14.3.5 LTS that fixes the problem described.\n\n### Credits\nThanks to S\u00e9bastien Convers for reporting this issue, and to Josua Vogel and Oliver Hader for fixing it.",
  "id": "GHSA-mfqj-cqv3-h7xw",
  "modified": "2026-08-31T19:53:59Z",
  "published": "2026-08-31T19:53:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/TYPO3/typo3/security/advisories/GHSA-mfqj-cqv3-h7xw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15305"
    },
    {
      "type": "WEB",
      "url": "https://github.com/TYPO3/typo3/commit/817ad41cc9dd28aac0fc4d0fe16fc25d46dd554a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/TYPO3/typo3/commit/cfda21050398eb145211a4fa6f9988f10e43e10b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-form/CVE-2026-15305.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/TYPO3/typo3"
    },
    {
      "type": "WEB",
      "url": "https://news.typo3.com/security/advisory/typo3-core-sa-2026-020"
    },
    {
      "type": "WEB",
      "url": "https://typo3.org/security/advisory/typo3-core-sa-2026-020"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "TYPO3 CMS - Unrestricted File Upload in Form Framework"
}

CVE-2026-15305 (GCVE-0-2026-15305)

Vulnerability from cvelistv5 – Published: 2026-07-14 12:45 – Updated: 2026-07-15 12:26

Title

TYPO3 CMS - Unrestricted File Upload in Form Framework

Summary

Users were able to upload files with arbitrary MIME types to forms using FileUpload or ImageUpload elements with allowedMimeTypes configured. The restriction was not enforced server-side because the MimeTypeValidator was registered during form building before concrete form definition properties were applied, resulting in the validator never being added to the processing pipeline. This issue affects TYPO3 CMS versions 14.2.0-14.3.4.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-14 13:26 UTC

CWE

CWE-351 - Insufficient Type Distinction

Assigner

TYPO3 mitre root

References

3 references

URL	Tags
https://typo3.org/security/advisory/typo3-core-sa…	vendor-advisory
https://github.com/TYPO3/typo3/commit/817ad41cc9d…	patch
https://github.com/TYPO3/typo3/commit/cfda2105039…	patch

Impacted products

1 product

Vendor	Product	Version
TYPO3	TYPO3 CMS	Affected: 14.2.0 , < 14.3.5 (semver) cpe:2.3:a:typo3:typo3::::::::

Credits

Josua Vogel Oliver Hader

Show details on NVD website

JSON

To clipboard

{
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        "metrics": [
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            "other": {
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                "id": "CVE-2026-15305",
                "options": [
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                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-14T13:26:13.647808Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-07-14T13:26:21.743Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://packagist.org",
          "defaultStatus": "unaffected",
          "modules": [
            "Form Framework"
          ],
          "packageName": "typo3/cms-form",
          "product": "TYPO3 CMS",
          "repo": "https://github.com/TYPO3/typo3",
          "vendor": "TYPO3",
          "versions": [
            {
              "lessThan": "14.3.5",
              "status": "affected",
              "version": "14.2.0",
              "versionType": "semver"
            }
          ]
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      ],
      "cpeApplicability": [
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            }
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        }
      ],
      "credits": [
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          "value": "Oliver Hader"
        }
      ],
      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
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            }
          ],
          "value": "Users were able to upload files with arbitrary MIME types to forms using FileUpload or ImageUpload elements with allowedMimeTypes configured. The restriction was not enforced server-side because the MimeTypeValidator was registered during form building before concrete form definition properties were applied, resulting in the validator never being added to the processing pipeline. This issue affects TYPO3 CMS versions 14.2.0-14.3.4."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
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            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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      "problemTypes": [
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      "providerMetadata": {
        "dateUpdated": "2026-07-15T12:26:56.912Z",
        "orgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
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      },
      "references": [
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          "tags": [
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          ],
          "url": "https://typo3.org/security/advisory/typo3-core-sa-2026-020"
        },
        {
          "name": "Git commit of main branch",
          "tags": [
            "patch"
          ],
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        },
        {
          "name": "Git commit of 14.3 branch",
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    "datePublished": "2026-07-14T12:45:10.996Z",
    "dateReserved": "2026-07-09T16:25:43.306Z",
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  },
  "dataType": "CVE_RECORD",
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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.
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.

Action not permitted

GHSA-MFQJ-CQV3-H7XW

Problem

Solution

Credits

CVE-2026-15305 (GCVE-0-2026-15305)

Tags

Sightings

Nomenclature

Related by attack behaviour