Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests
Priority MEDIUM 64CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00415 36th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| semaphoreui | semaphore | up to 2.19.12 | — | No fix listed | CNA |
- semaphore Vendorsemaphoreui Affected up to 2.19.12 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-91994
- 2026-10-03 Alias added: GHSA-rvf3-c57p-p58j
References
More semaphoreui vulnerabilities
- TI-2026-51419 Semaphore U: OS Command Injection CVSS 3.1CRITICAL 9.9
- TI-2026-51418 Semaphore UI: Manager-to-owner privilege escalation via custom-role slug collision CVSS 3.1HIGH 8.8
- TI-2026-76499 Remote code execution in Semaphore UI via Ansible variable override CVSS 4.0HIGH 8.7
- TI-2026-51417 Semaphore UI: CSRF vulnerability on password change endpoint - No CSRF token or password confirmation CVSS 3.1HIGH 8.3
Sources
- CVE-2026-91994 · CVE Program
- CVE-2026-91994 · NVD
- FIRST EPSS
- GHSA-rvf3-c57p-p58j · GitHub Advisory Database · CC BY 4.0
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