CVE-2026-73293highCWE-269

CVE-2026-73293: high-severity vulnerability in semaphoreui semaphore

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

Published

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.8epss 0.6%
exploitation probability
0.6%top 54% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
semaphoreui · semaphore
Related CVEs — semaphoreui semaphore

In the same product, most dangerous first.

CVE-2026-73294CRITICALSemaphore U: OS Command InjectionEPSS 0.7%CVE-2026-91994HIGHSemaphore UI through 2.19.12 Missing Authorization on GET and HEAD RequestsEPSS 0.4%CVE-2026-73292HIGHSemaphore UI: CSRF vulnerability on password change endpoint - No CSRF token or password confirmationEPSS 0.2%
References
https://github.com/semaphoreui/semaphore/commit/1c4bb65df114962134f8829d4a03667106a01a68https://github.com/semaphoreui/semaphore/commit/bb2a4e1f08c8023e618f8dd6eaca73554f2c33bbhttps://github.com/semaphoreui/semaphore/releases/tag/v2.18.19https://github.com/semaphoreui/semaphore/releases/tag/v2.19.5-beta5https://github.com/semaphoreui/semaphore/security/advisories/GHSA-cxvf-gvfq-36w2