CVE-2026-73293 - Semaphore UI: Manager-to-owner privilege escalation via custom-role slug collision

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HIGH

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

Published Aug 12, 2026

8.8

HIGH

CVSS 3.1

EPSS 0.57%

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 products

Vendor Semaphoreui Product Semaphore Default
n/a
- Version
  < 2.18.19
  Status
  affected
  Constraints
  -
- Version
  >= 2.19.0-alpha3, < 2.19.5-beta5
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Semaphoreui

Semaphore

n/a

Version	Status	Constraints
< 2.18.19	affected	-
>= 2.19.0-alpha3, < 2.19.5-beta5	affected	-

Ecosystem	Package	Introduced	Fixed
Go	github.com/semaphoreui/semaphore	0	0.0.0-20260705182501-bb2a4e1f08c8

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-269

Improper Privilege Management

References (7)

https://github.com/advisories/GHSA-cxvf-gvfq-36w2
Advisory
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
https://github.com/semaphoreui/semaphore/security/advisories/GHSA-cxvf-gvfq-36w2
exploitx_refsource_CONFIRM
https://nvd.nist.gov/vuln/detail/CVE-2026-73293

Link	Providers	Tags
https://github.com/advisories/GHSA-cxvf-gvfq-36w2		Advisory
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
https://github.com/semaphoreui/semaphore/security/advisories/GHSA-cxvf-gvfq-36w2		exploitx_refsource_CONFIRM
https://nvd.nist.gov/vuln/detail/CVE-2026-73293