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CVE-2026-24687 — Vulnerability in Umbraco.Forms — CVE Details

MEDIUM

Umbraco.Forms has Path Traversal and File Enumeration Vulnerabilities in Linux/Mac

Published January 30, 2026Updated February 3, 2026Source: osv

Summary

### Impact It's possible for an authenticated backoffice-user to enumerate and traverse paths/files on the systems filesystem and read their contents, on Mac/Linux Umbraco installations using Forms. As Umbraco Cloud runs in a Windows environment, Cloud users aren't affected. ### Patches This issue affects versions 16 and 17 of Umbraco Forms and is patched in 16.4.1 and 17.1.1 ### Workarounds If upgrading is not immediately possible, users can mitigate this vulnerability by: * Configuring a WAF or reverse proxy to block requests containing path traversal sequences (`../`, `..\`) in the `fileName` parameter of the export endpoint * Restricting network access to the Umbraco backoffice to trusted IP ranges * Blocking the `/umbraco/forms/api/v1/export` endpoint entirely if the export feature is not required However, upgrading to the patched version is strongly recommended. ### References Credit to Kevin Joensen from Baldur Security for finding this vulnerability

Advisory Timeline

  • First published January 30, 2026 (255 days ago).
  • Last revised February 3, 2026 — 4 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update Umbraco.Forms to 16.4.1 or later
dotnet add package Umbraco.Forms --version 16.4.1
NuGet
Update Umbraco.Forms to 17.1.1 or later
dotnet add package Umbraco.Forms --version 17.1.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
Umbraco.Forms
nuget
16.0.0, 16.1.0, 16.2.0, 16.2.0-rc (+8 more)16.4.1
Umbraco.Forms
nuget
17.0.0, 17.0.1, 17.0.2, 17.0.3 (+3 more)17.1.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 6.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2026-24687?
Umbraco.Forms has Path Traversal and File Enumeration Vulnerabilities in Linux/Mac This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 6.1/10).
How do I check if my project is affected by CVE-2026-24687?
CVE-2026-24687 affects Umbraco.Forms. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-24687 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
6.1

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-hm5p-82g6-m3xh

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