CVE-2026-91994
Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 15, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 15, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
semaphoresemaphoreui |
|
References
- GitHub Issue #4150issue-trackingexploit
- GetMustCanMiddleware at v2.19.12technical-description
- projectUserAPI environment routes at v2.19.12technical-description
- https://github.com/semaphoreui/semaphoreproduct
- VulnCheck Advisory: Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requeststhird-party-advisory
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