🛡️ CVE-2026-24687 — umbraco-forms

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-22 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2026-24687 is classified as CWE-22: Path Traversal. A file path built from user input is not confined to the intended directory, letting an attacker reach files elsewhere on the filesystem.

Affected software

CVE-2026-24687 is recorded against 2 packages.

  • umbraco-forms (from 17.0.0 up to 17.1.1)
  • umbraco.forms (from 17.0.0 up to 17.1.1)

Timeline and source

Published on 29 January 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE CWE-22
Public Exploit ✅ No
Source NVD
Published 2026-01-29
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
umbraco-forms 17.0.0 17.1.1
umbraco.forms 17.0.0 17.1.1

Similar Threats

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