CVE-2026-24687Network attack vector

Authenticated file disclosure via export path traversal

Published Jan 29, 2026 · Updated Jan 29, 2026

Path traversal in Umbraco Forms 16 before 16.4.1 and 17 before 17.1.1 allows remote authenticated users to read server files. The export endpoint resolves the attacker-controlled fileName parameter without preventing traversal sequences from escaping the intended directory. Exploitation requires a backoffice account and a Linux or macOS installation; Windows-hosted Umbraco Cloud deployments are unaffected, and the reported impact is file disclosure.

CVSS severity6.0
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Umbraco Forms 16 before 16.4.1 and 17 before 17.1.1 allows remote authenticated users to read server files. The export endpoint resolves the attacker-controlled fileName parameter without preventing traversal sequences from escaping the intended directory. Exploitation requires a backoffice account and a Linux or macOS installation; Windows-hosted Umbraco Cloud deployments are unaffected, and the reported impact is file disclosure.

The record

CVE
CVE-2026-24687
Published
Jan 29, 2026
Updated
Jan 29, 2026
Vendor
Umbraco
Product
Umbraco Forms
Classifications
CWE-22, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 16.0.0, < 16.4.1
  2. Affected versionversion=>= 17.0.0, < 17.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Umbraco · Umbraco Formsversion=>= 16.0.0, < 16.4.1; version=>= 17.0.0, < 17.1.1

Published CVSS scores

6.0GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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