Host Header Injection Vulnerability in OmniAuth by OmniAuth
CVE-2026-63183

6.9MEDIUM

Key Information:

Vendor

Omniauth

Status
Omniauth
Vendor
CVE Published:
4 November 2026

What is CVE-2026-63183?

OmniAuth is an authentication system that leverages Rack middleware, which until version 2.2.0, could be vulnerable to host header injection attacks. This vulnerability arises when applications fail to validate incoming host headers. An unauthenticated remote attacker could exploit this by supplying a malicious Host header, leading to potential security risks in applications without proper host validation configurations. It's crucial for developers to upgrade to version 2.2.0 or implement robust host authorization to mitigate these risks.

Affected Version(s)

omniauth < 2.2.0

References

https://github.com/omniauth/omniauth/security/advisories/...
x_refsource_CONFIRM
https://github.com/omniauth/omniauth/commit/943b44faea242...
x_refsource_MISC

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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