CVE-2026-73293

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

Published Aug 12, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Github GHSA Github GHSA GHSA-cxvf-gvfq-36w2 Semaphore UI: Manager-to-owner privilege escalation via custom-role slug collision
History
Type Values Removed Values Added
First Time appeared Semaphoreui
Semaphoreui semaphore
Vendors & Products Semaphoreui
Semaphoreui semaphore
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Semaphore UI: Manager-to-owner privilege escalation via custom-role slug collision
Weaknesses CWE-269
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 12, 2026, 4:56 PM
Reserved
Aug 11, 2026, 7:42 PM
Status
Deferred
Published
Aug 12, 2026, 4:17 PM
Modified
Oct 24, 2026, 3:10 PM