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CVE-2026-63183— OmniAuth: Host Header Injection Vulnerability

Quick assessment

Affected
omniauth omniauth
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OmniAuth 是一个基于 Rack 中间件的灵活身份验证系统。在 2.2.0 版本之前，若未配置固定的 或未在框架层面启用传入主机头验证，OmniAuth 会从由请求控制的主机信息中推导提供商的回调 URL。远程未认证的攻击者可伪造 Host 请求头，从而在那些未对传入主机头进行验证的 Web 框架应用中引发主机头注入风险。已正确配置 Rails 主机授权或使用了固定 的应用不受此路径影响。该问题已在 2.2.0 版本中修复。

CVSS 6.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
omniauth omniauth < 2.2.0 affected
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I. Basic Information for CVE-2026-63183

Vulnerability Information
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Vulnerability Title
OmniAuth: Host Header Injection Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
omniauth omniauth < 2.2.0 -

II. Public POCs for CVE-2026-63183

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III. Intelligence Information for CVE-2026-63183

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Other References for CVE-2026-63183 (2)

IV. Related Vulnerabilities

Same vendor: omniauth
Same weakness: CWE-346