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Semaphore EUVDEUVD-2026-78434

| CVE-2026-91994 HIGH
Missing Authorization (CWE-862)
2026-09-15 VulnCheck GHSA-rvf3-c57p-p58j
Authentication Bypass Semaphore Semaphoreui
7.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
POC Analysis Generated
Sep 15, 2026 - 15:22 vuln.today
Analysis Generated
Sep 15, 2026 - 12:05 vuln.today
CVE Published
Sep 15, 2026 - 11:35 cve.org
HIGH 7.1

DescriptionCVE.org

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.

AnalysisAI

Semaphore UI through 2.19.12 fails to enforce project-level resource permissions on GET and HEAD requests in its GetMustCanMiddleware, letting any authenticated user holding only the low-privileged guest or task_runner role read every project's environment records. Those environment records store plaintext secrets, credentials, and passwords used to reach managed infrastructure, so a read-only account can effectively harvest the keys to the entire estate. …

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EUVD-2026-78434 vulnerability details – vuln.today
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