CVE-2026-91994: Missing Authorization in semaphoreui semaphore
Semaphore UI versions up to 2.19.12 have a missing authorization vulnerability in the GetMustCanMiddleware that exempts GET and HEAD requests from project resource permission checks. This allows attackers with guest or task_runner roles to read all project environments, including sensitive plaintext secrets, credentials, and passwords via GET requests to the environment endpoint.
AI Analysis
Technical Summary
CVE-2026-91994 is a missing authorization vulnerability in Semaphore UI through version 2.19.12. The flaw exists because GET and HEAD requests are exempted from permission checks in the GetMustCanMiddleware, enabling users with limited roles such as guest or task_runner to access all project environment data. This includes sensitive information like plaintext secrets, credentials, and passwords accessible via GET requests to the environment endpoint.
Potential Impact
Attackers with guest or task_runner roles can read all project environment data, including plaintext secrets, credentials, and passwords. This unauthorized access to sensitive information can lead to further compromise of projects and systems relying on these secrets.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict guest and task_runner roles from accessing the environment endpoint or disable GET and HEAD requests to this endpoint if possible.
CVE-2026-91994: Missing Authorization in semaphoreui semaphore
Description
Semaphore UI versions up to 2.19.12 have a missing authorization vulnerability in the GetMustCanMiddleware that exempts GET and HEAD requests from project resource permission checks. This allows attackers with guest or task_runner roles to read all project environments, including sensitive plaintext secrets, credentials, and passwords via GET requests to the environment endpoint.
CVSS v4.0
Score 7.1high
Affected software
semaphoreui
semaphore
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-91994 is a missing authorization vulnerability in Semaphore UI through version 2.19.12. The flaw exists because GET and HEAD requests are exempted from permission checks in the GetMustCanMiddleware, enabling users with limited roles such as guest or task_runner to access all project environment data. This includes sensitive information like plaintext secrets, credentials, and passwords accessible via GET requests to the environment endpoint.
Potential Impact
Attackers with guest or task_runner roles can read all project environment data, including plaintext secrets, credentials, and passwords. This unauthorized access to sensitive information can lead to further compromise of projects and systems relying on these secrets.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict guest and task_runner roles from accessing the environment endpoint or disable GET and HEAD requests to this endpoint if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-15T11:11:13.312Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa9305055bf5e2cf5c40bd2
Added to database: 09/15/2026, 11:47:28 UTC
Last enriched: 09/15/2026, 12:01:36 UTC
Last updated: 09/15/2026, 12:23:34 UTC
Views: 6
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