Semaphoreui Semaphore vulnerabilities

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Published CVEs affecting Semaphoreui Semaphore: 4 record(s), with affected versions and fixes.

CVE-2026-91994 Medium · 6.5 CWE-862 Sep 15, 2026

Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests

Semaphore UI through 2.19.12 exempts GET and HEAD requests from project resource permission checks in GetMustCanMiddleware. Attackers with guest or task_runner roles can read all project environments including plaintext secrets, credentials, and passwords via GET requests to the environment endpoint.

CVE-2026-73294 Critical · 9.9 CWE-78 Aug 12, 2026

Semaphore U: OS Command Injection

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.

CVE-2026-73293 High · 8.8 CWE-269 Aug 12, 2026

Semaphore UI: Manager-to-owner privilege escalation via custom-role slug collision

Semaphore UI is a web interface for managing DevOps tools. Prior to 2.18.19 and from 2.19.0-alpha3 until 2.19.5-beta5, ProjectMiddleware and GetProjectOrGlobalRoleBySlug allow a project manager to use POST /api/project/{id}/roles to create a custom manager role with permission bitmask 15, overriding the built-in manager permissions and granting CanUpdateProject and CanManageProjectUsers owner capabilities. This issue is fixed in versions 2.18.19 and 2.19.5-beta5.

CVE-2026-73292 High · 8.3 CWE-352 Aug 12, 2026

Semaphore UI: CSRF vulnerability on password change endpoint - No CSRF token or password confirmation

Semaphore UI is a web interface for managing DevOps tools. Prior to 2.18.21, the /api/users/{id}/password endpoint accepts a cross-site request using the authenticated user's semaphore session cookie without CSRF protection or current-password confirmation, allowing an unauthenticated attacker to change an administrator's or another user's password after user interaction. This issue is fixed in version 2.18.21.