high8.8
CVE-2026-73293
Semaphore UI: Manager-to-owner privilege escalation via custom-role slug collision
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/semaphoreui/semaphore | < 0.0.0-20260705182501-bb2a4e1f08c8 | 0.0.0-20260705182501-bb2a4e1f08c8 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-cxvf-gvfq-36w2
- https://github.com/semaphoreui/semaphore/security/advisories/GHSA-cxvf-gvfq-36w2
- https://nvd.nist.gov/vuln/detail/CVE-2026-73293
- https://github.com/semaphoreui/semaphore/commit/1c4bb65df114962134f8829d4a03667106a01a68
- https://github.com/semaphoreui/semaphore/commit/bb2a4e1f08c8023e618f8dd6eaca73554f2c33bb
- https://github.com/semaphoreui/semaphore/releases/tag/v2.18.19
- https://github.com/semaphoreui/semaphore/releases/tag/v2.19.5-beta5