CVE-2026-73293: CWE-269: Improper Privilege Management in semaphoreui semaphore
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.
AI Analysis
Technical Summary
Semaphore UI's ProjectMiddleware and GetProjectOrGlobalRoleBySlug components improperly allow a project manager to escalate privileges via the POST /api/project/{id}/roles endpoint. By creating a custom manager role with a permission bitmask of 15, the attacker can override built-in manager permissions and gain owner capabilities. This vulnerability affects versions prior to 2.18.19 and from 2.19.0-alpha3 through 2.19.5-beta5 and is fixed in 2.18.19 and 2.19.5-beta5.
Potential Impact
An authenticated project manager can escalate privileges to owner-level permissions, enabling them to update projects and manage project users. This results in a high impact on confidentiality, integrity, and availability of project management functions within Semaphore UI.
Mitigation Recommendations
Upgrade Semaphore UI to version 2.18.19 or later, or to 2.19.5-beta5 or later. These versions contain fixes that prevent privilege escalation via custom manager roles. Patch status is not explicitly stated as 'official-fix' but the description confirms the issue is fixed in these versions.
CVE-2026-73293: CWE-269: Improper Privilege Management in semaphoreui semaphore
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.
CVSS v3.1
Score 8.8high
Affected software
pkg:github/semaphoreui/semaphoreRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Semaphore UI's ProjectMiddleware and GetProjectOrGlobalRoleBySlug components improperly allow a project manager to escalate privileges via the POST /api/project/{id}/roles endpoint. By creating a custom manager role with a permission bitmask of 15, the attacker can override built-in manager permissions and gain owner capabilities. This vulnerability affects versions prior to 2.18.19 and from 2.19.0-alpha3 through 2.19.5-beta5 and is fixed in 2.18.19 and 2.19.5-beta5.
Potential Impact
An authenticated project manager can escalate privileges to owner-level permissions, enabling them to update projects and manage project users. This results in a high impact on confidentiality, integrity, and availability of project management functions within Semaphore UI.
Mitigation Recommendations
Upgrade Semaphore UI to version 2.18.19 or later, or to 2.19.5-beta5 or later. These versions contain fixes that prevent privilege escalation via custom manager roles. Patch status is not explicitly stated as 'official-fix' but the description confirms the issue is fixed in these versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-11T19:42:11.450Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7c97d0bf8831d539c53415
Added to database: 08/12/2026, 15:57:04 UTC
Last enriched: 08/12/2026, 16:11:36 UTC
Last updated: 08/12/2026, 17:11:43 UTC
Views: 5
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