CVE-2026-73294: Semaphore U: OS Command Injection

Published Aug 12, 2026
·
Updated

Semaphore UI is a web interface for managing DevOps tools. Prior to 2.18.17 and 2.19.5-beta2, repository giturl handling passes an attacker-controlled --upload-pack option to CmdGitClient.GetLastRemoteCommitHash through POST /api/project/{id}/repositories and scheduled commit-hash polling, allowing a project Manager or Owner to execute arbitrary OS commands in the Semaphore server process. This issue is fixed in versions 2.18.17 and 2.19.5-beta2.

Affected Software

1 affected component
Semaphore Semaphore UI>2.18.17<2.19.5-beta2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.18.17
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.19.5-beta2

Event History

Aug 12, 2026
CVE Published
via MITRE·03:55 PM
Data Sourced
via MITRE·03:55 PM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-73294?

CVE-2026-73294 has a critical severity rating of 9.9.

2

What type of vulnerability is CVE-2026-73294?

CVE-2026-73294 is an OS Command Injection vulnerability in Semaphore UI.

3

How can I fix CVE-2026-73294?

To fix CVE-2026-73294, update Semaphore to version 2.18.17 or 2.19.5-beta2 or later.

4

What systems are affected by CVE-2026-73294?

CVE-2026-73294 affects Semaphore UI versions prior to 2.18.17 and 2.19.5-beta2.

5

What can an attacker do with CVE-2026-73294?

An attacker can exploit CVE-2026-73294 to execute arbitrary commands on the server via crafted git_url input.

Company

Resources

Contact

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CVE-2026-73294 - Semaphore U: OS Command Injection - SecAlerts