Medium · CVSS 6.9CVE-2026-63183

OmniAuth: Host Header Injection VulnerabilityCVE-2026-63183

Answer in brief

CVE-2026-63183 records a Medium severity (CVSS 6.9) vulnerability in OmniAuth: Host Header Injection Vulnerability. The current sources do not mark it as known exploited. The current feed maps omniauth/omniauth (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 Nov 4, 2026Updated Nov 4, 2026Source checked Nov 4, 2026First seen by HOL Nov 4, 2026Material review Nov 4, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.9. 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 omniauth/omniauth (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
omniauth/omniauthgeneric	<2.2.0	2.2.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for omniauth/omniauth.
Review the reported fix. Update omniauth/omniauth to 2.2.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Nov 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Nov 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Nov 4, 2026

Sources and claim methodology

Upstream source description

OmniAuth is a flexible authentication system utilizing Rack middleware. Prior to 2.2.0, OmniAuth derives provider callback URLs from request-controlled host information when neither a fixed full_host nor framework-level incoming host validation is configured. A remote unauthenticated client can supply a forged Host header, creating a host header injection risk in applications whose web framework does not verify incoming host headers. Applications using appropriately configured Rails host authorization or a fixed full_host are not affected by this path. This issue is fixed in version 2.2.0.

Quoted source text, attributed separately from HOL analysis.