What’s Vulnerable › Vulnerabilities

CVE-2026-91994: Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-24
• Weakness: CWE-862

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

• semaphoreui semaphore: through 2.19.12

References

• https://github.com/semaphoreui/semaphore
• https://github.com/semaphoreui/semaphore/blob/v2.19.12/api/projects/project.go#L89-L106
• https://github.com/semaphoreui/semaphore/blob/v2.19.12/api/router.go#L308-L329
• https://github.com/semaphoreui/semaphore/issues/4150
• https://www.vulncheck.com/advisories/semaphore-ui-through-2.19.12-missing-authorization-on-get-and-head-requests

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