CVE-2026-73294
Critical
Description
Semaphore UI is a web interface for managing DevOps tools. Prior to 2.18.17 and 2.19.5-beta2, repository git_url 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.
SeverityCritical
CVSS9.9
Exploit probability—
ProductGithub.com/semaphoreui/semaphore
PublishedAug 12, 2026
First seenAug 12, 2026
Weakness typeCWE-78OS command injectionCWE-88CWE-88
How to fix
Update
- github.com/semaphoreui/semaphore0.0.0-20260704181911-7e8a9434bd81 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/semaphoreui/semaphoreGo | v < 0.0.0-20260704181911-7e8a9434bd81 | 0.0.0-20260704181911-7e8a9434bd81 |
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