CVE-2026-73294
Semaphore U: OS Command Injection
CVSS Score
9.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-78 CWE-88 |
| Vendor | semaphoreui |
| Product | semaphore |
| Published | Aug 12, 2026 |
| Last Updated | Aug 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
semaphoreui / semaphore
< 2.18.17 >= 2.19.0-alpha3, < 2.19.5-beta2
References
github.com: https://github.com/semaphoreui/semaphore/security/advisories/GHSA-xp7j-h7jc-4w8p github.com: https://github.com/semaphoreui/semaphore/commit/7e8a9434bd81b82cf42220151c74801ea97542d6 github.com: https://github.com/semaphoreui/semaphore/commit/a7a7a33a64aea382a0726b3722856f298663eacf github.com: https://github.com/semaphoreui/semaphore/tree/v2.18.17 github.com: https://github.com/semaphoreui/semaphore/tree/v2.19.5-beta2