---
id: CVE-2026-91994
title: >-
  Semaphore UI through 2.19.12 exempts GET and HEAD requests from project
  resource permission checks in GetMustCanMiddleware
summary: >-
  Semaphore UI through 2.19.12 exempts GET and HEAD requests from project
  resource permission checks in GetMustCanMiddleware. Attackers with guest or
  task_runner roles can read all project environments including plaintext
  secrets, credenti…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-862
vendor: semaphoreui
product: semaphore
affected:
  - semaphore <= 2.19.12
published: '2026-09-15'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:28:01.780'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91994'
references:
  - url: 'https://github.com/semaphoreui/semaphore'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/semaphoreui/semaphore/blob/v2.19.12/api/projects/project.go#L89-L106
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/semaphoreui/semaphore/blob/v2.19.12/api/router.go#L308-L329
    label: disclosure@vulncheck.com
  - url: 'https://github.com/semaphoreui/semaphore/issues/4150'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/semaphore-ui-through-2.19.12-missing-authorization-on-get-and-head-requests
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00415
epssPercentile: 0.33139
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T12:36:45.634709Z'
ingestedAt: '2026-09-15T12:36:50.173Z'
---

## Overview

Semaphore UI through 2.19.12 exempts GET and HEAD requests from project resource permission checks in GetMustCanMiddleware. Attackers with guest or task_runner roles can read all project environments including plaintext secrets, credentials, and passwords via GET requests to the environment endpoint.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.