Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests (CVE-2026-91994) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-91994

Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests

Answer in brief

CVE-2026-91994 records a Unknown severity vulnerability in Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests. The current sources do not mark it as known exploited. The current feed maps semaphoreui/semaphore (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 15, 2026Source checked Sep 15, 2026First seen by HOL Sep 15, 2026Material review Sep 15, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps semaphoreui/semaphore (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
semaphoreui/semaphoregeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for semaphoreui/semaphore.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 15, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.