cvelistv5 - cve-2025-66625

CVE-2025-66625 (GCVE-0-2025-66625)

Vulnerability from cvelistv5 – Published: 2025-12-09 20:09 – Updated: 2025-12-12 20:33

Title

Umbraco Vulnerable to Improper File Access and Credential Exposure through Dictionary Import Functionality

Summary

Umbraco is an ASP.NET CMS. Due to unsafe handling and deletion of temporary files in versions 10.0.0 through 13.12.0, during the dictionary upload process an attacker with access to the backoffice can trigger predictable requests to temporary file paths. The application’s error responses (HTTP 500 when a file exists, 404 when it does not) allow the attacker to enumerate the existence of arbitrary files on the server’s filesystem. This vulnerability does not allow reading or writing file contents. In certain configurations, incomplete clean-up of temporary upload files may additionally expose the NTLM hash of the Windows account running the Umbraco application. This issue is fixed in version 13.12.1.

Severity ?

4.9 (Medium)


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

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-377 - Insecure Temporary File
CWE-552 - Files or Directories Accessible to External Parties

Assigner

GitHub_M

References

URL

Tags

	https://github.com/umbraco/Umbraco-CMS/security/a…	x_refsource_CONFIRM
	https://github.com/umbraco/Umbraco-CMS/commit/750…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	umbraco	Umbraco-CMS	Affected: 10.0.0, < 13.12.1

Show details on NVD website

JSON

To clipboard

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GHSA-HFV2-PF68-M33X

Vulnerability from github – Published: 2025-12-09 17:12 – Updated: 2025-12-09 21:37

Summary

Umbraco Vulnerable to Improper File Access and Credential Exposure in Dictionary Import Functionality

Details

Impact

Due to unsafe handling and deletion of temporary files during the dictionary upload process, an attacker with access to the backoffice can trigger predictable requests to temporary file paths. The application’s error responses (HTTP 500 when a file exists, 404 when it does not) allow the attacker to enumerate the existence of arbitrary files on the server’s filesystem. This vulnerability does not allow reading or writing file contents.

In certain configurations, incomplete clean-up of temporary upload files may additionally expose the NTLM hash of the Windows account running the Umbraco application. The direct impact of this vulnerability is therefore limited to confidentiality, which is reflected in its CVSS base score of 4.9

While the CVSS Base Score captures only the immediate effect, the practical risk varies significantly based on hosting environment and identity configuration. Umbraco Cloud sites run under low-privilege, isolated Azure App Service worker identities, which mitigates the impact of any credential exposure. In contrast, self-hosted deployments could run Umbraco using privileged local or domain accounts. If such an account’s NTLM hash is disclosed, an attacker may be able to: - Perform NTLM relay attacks - Crack the hash offline to recover the underlying password - Authenticate as the compromised identity - Access internal systems trusted by that identity - Move laterally within the network - Potentially escalate to full domain compromise in weakly segmented environments

These outcomes are not part of the CVSS base score, which only rates the immediate confidentiality impact, but represent realistic downstream consequences for installations using elevated or widely-trusted service accounts. Self-hosted environments running Umbraco under privileged identities are therefore at significantly higher risk.

Vulnerability found and reported by Tomasz Holeksa at Pentest Limited

Patches

The issue has been patched in 13.12.1.

Workarounds

The issue can only be exploited by authorized backoffice accounts with access to the "Translations" section.

Severity ?

4.9 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 13.12.0"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Umbraco.Cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.0.0"
            },
            {
              "fixed": "13.12.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-66625"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-377",
      "CWE-552"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-09T17:12:18Z",
    "nvd_published_at": "2025-12-09T20:15:55Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nDue to unsafe handling and deletion of temporary files during the dictionary upload process, an attacker with access to the backoffice can trigger predictable requests to temporary file paths. The application\u2019s error responses (HTTP 500 when a file exists, 404 when it does not) allow the attacker to enumerate the existence of arbitrary files on the server\u2019s filesystem. This vulnerability does not allow reading or writing file contents.\n\nIn certain configurations, incomplete clean-up of temporary upload files may additionally expose the NTLM hash of the Windows account running the Umbraco application. The direct impact of this vulnerability is therefore limited to confidentiality, which is reflected in its CVSS base score of 4.9\n\nWhile the CVSS Base Score captures only the immediate effect, the practical risk varies significantly based on hosting environment and identity configuration. Umbraco Cloud sites run under low-privilege, isolated Azure App Service worker identities, which mitigates the impact of any credential exposure. In contrast, self-hosted deployments could run Umbraco using privileged local or domain accounts. If such an account\u2019s NTLM hash is disclosed, an attacker may be able to:\n- Perform NTLM relay attacks\n- Crack the hash offline to recover the underlying password\n- Authenticate as the compromised identity\n- Access internal systems trusted by that identity\n- Move laterally within the network\n- Potentially escalate to full domain compromise in weakly segmented environments\n\nThese outcomes are not part of the CVSS base score, which only rates the immediate confidentiality impact, but represent realistic downstream consequences for installations using elevated or widely-trusted service accounts. Self-hosted environments running Umbraco under privileged identities are therefore at significantly higher risk.\n\nVulnerability found and reported by Tomasz Holeksa at Pentest Limited\n\n### Patches\nThe issue has been patched in 13.12.1.\n\n### Workarounds\nThe issue can only be exploited by authorized backoffice accounts with access to the \"Translations\" section.",
  "id": "GHSA-hfv2-pf68-m33x",
  "modified": "2025-12-09T21:37:25Z",
  "published": "2025-12-09T17:12:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hfv2-pf68-m33x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66625"
    },
    {
      "type": "WEB",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/7505efd433189037f46547932d4a8b603fd4a615"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/umbraco/Umbraco-CMS"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Umbraco Vulnerable to Improper File Access and Credential Exposure in Dictionary Import Functionality"
}

FKIE_CVE-2025-66625

Vulnerability from fkie_nvd - Published: 2025-12-09 20:15 - Updated: 2025-12-12 15:19

Severity ?

4.9 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/umbraco/Umbraco-CMS/commit/7505efd433189037f46547932d4a8b603fd4a615
	security-advisories@github.com	https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hfv2-pf68-m33x

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Umbraco is an ASP.NET CMS. Due to unsafe handling and deletion of temporary files in versions 10.0.0 through 13.12.0, during the dictionary upload process an attacker with access to the backoffice can trigger predictable requests to temporary file paths. The application\u2019s error responses (HTTP 500 when a file exists, 404 when it does not) allow the attacker to enumerate the existence of arbitrary files on the server\u2019s filesystem. This vulnerability does not allow reading or writing file contents. In certain configurations, incomplete clean-up of temporary upload files may additionally expose the NTLM hash of the Windows account running the Umbraco application. This issue is fixed in version 13.12.1."
    }
  ],
  "id": "CVE-2025-66625",
  "lastModified": "2025-12-12T15:19:07.567",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
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        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/7505efd433189037f46547932d4a8b603fd4a615"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hfv2-pf68-m33x"
    }
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          "lang": "en",
          "value": "CWE-200"
        },
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          "value": "CWE-377"
        },
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          "value": "CWE-552"
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      "type": "Primary"
    }
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2025-66625 (GCVE-0-2025-66625)

GHSA-HFV2-PF68-M33X

Impact

Patches

Workarounds

FKIE_CVE-2025-66625

Tags

Sightings

Nomenclature