CVE-2026-73293: Semaphoreui Semaphore

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Semaphoreui Semaphore: before 2.18.19 (fixed in 2.18.19); from 2.19.0-alpha3, before 2.19.5-beta5 (fixed in 2.19.5-beta5)

Published 2026-08-12. Last modified 2026-09-09.