Vulnerability · Published Aug 12, 2026 · Assigned by GitHub_M
CVE-2026-73293Semaphore UI: Manager-to-owner privilege escalation via custom-role slug collision
High 8.8
In plain English
A high-severity privilege mismanagement in semaphore from semaphoreui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/semaphoreui/semaphore | 0.0.0-20260705182501-bb2a4e1f08c8 | GHSA-cxvf-gvfq-36w2 |
| Go | github.com/semaphoreui/semaphore | 0.0.0-20260705182501-bb2a4e1f08c8 | GO-2026-6371 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| semaphoreui | semaphore | < 2.18.19>= 2.19.0-alpha3, < 2.19.5-beta5 |
Weakness: CWE-269 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/semaphoreui/semaphore/security/advisories/GHSA-cxvf-gvfq-36w2 x_refsource_CONFIRM
- https://github.com/semaphoreui/semaphore/commit/1c4bb65df114962134f8829d4a03667106a01a68 x_refsource_MISC
- https://github.com/semaphoreui/semaphore/commit/bb2a4e1f08c8023e618f8dd6eaca73554f2c33bb x_refsource_MISC
- https://github.com/semaphoreui/semaphore/releases/tag/v2.18.19 x_refsource_MISC
- https://github.com/semaphoreui/semaphore/releases/tag/v2.19.5-beta5 x_refsource_MISC