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TI-2025-41019 Aliases CVE-2025-66625GHSA-hfv2-pf68-m33x

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

Priority LOW 22CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00357 29th percentileScored 2026-11-07
Fix Fixed Umbraco.Cms (NuGet): 13.12.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
umbracoUmbraco-CMS10.0.0, < 13.12.1—No fix listedCNA
—Umbraco.Cms (NuGet)10.0.0 to before 13.12.113.12.1Patch availableGHSA-hfv2-pf68-m33x
  • Umbraco-CMS Vendorumbraco Affected 10.0.0, < 13.12.1 Fixed in — No fix listed CNA
  • Umbraco.Cms (NuGet) Vendor— Affected 10.0.0 to before 13.12.1 Fixed in 13.12.1 Patch available GHSA-hfv2-pf68-m33x

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*10.0.0 to before 13.12.1Vulnerableumbraco
  • cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* Versions 10.0.0 to before 13.12.1 Vulnerable ·umbraco

Remediation

  • Fix · GHSA-hfv2-pf68-m33x Umbraco.Cms (NuGet) Fixed in 13.12.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-66625
  2. 2026-10-03 Alias added: GHSA-hfv2-pf68-m33x

References

Patch 2

Advisory 1

Other 1

  • TI-2025-41183 An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute… CVSS 3.1CRITICAL 10.0
  • TI-2012-05477 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE CVSS 4.0CRITICAL 9.3
  • TI-2021-22392 Umbraco v8.14.1 - 'baseUrl' SSRF CVSS 4.0MEDIUM 6.9
  • TI-2024-36846 A stored cross-site scripting (XSS) vulnerability in Umbraco CMS v14.3.1 allows attackers… CVSS 3.1MEDIUM 6.5
  • TI-2019-15240 Umbraco CMS 4.11.8 through 7.15.10, and 7.12.4, allows Remote Code Execution by… CVSS 3.1HIGH 7.2
  • TI-2020-04738 Cross-site scripting in Umbraco CMS CVSS 3.1MEDIUM 5.4
See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences