CVE-2026-73293
Semaphore UI: Manager-to-owner privilege escalation via custom-role slug collision
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-269 |
| 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:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
semaphoreui / semaphore
< 2.18.19 >= 2.19.0-alpha3, < 2.19.5-beta5
References
github.com: https://github.com/semaphoreui/semaphore/security/advisories/GHSA-cxvf-gvfq-36w2 github.com: https://github.com/semaphoreui/semaphore/commit/1c4bb65df114962134f8829d4a03667106a01a68 github.com: https://github.com/semaphoreui/semaphore/commit/bb2a4e1f08c8023e618f8dd6eaca73554f2c33bb github.com: https://github.com/semaphoreui/semaphore/releases/tag/v2.18.19 github.com: https://github.com/semaphoreui/semaphore/releases/tag/v2.19.5-beta5