Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck
CVE-2026-91994Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests
Medium 6.5
In plain English
A medium-severity missing authorization in semaphore from semaphoreui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 64.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| semaphoreui | semaphore | 0 – through 2.19.12 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- GitHub Issue #4150 issue-tracking, exploit
- GetMustCanMiddleware at v2.19.12 technical-description
- projectUserAPI environment routes at v2.19.12 technical-description
- https://github.com/semaphoreui/semaphore product
- VulnCheck Advisory: Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests third-party-advisory