OmniAuth up to 2.1.x Provider Callback URL Derivation injection

Summaryinfo

A vulnerability classified as critical has been found in OmniAuth up to 2.1.x. This issue affects some unknown processing of the component Provider Callback URL Derivation. The manipulation leads to injection. This vulnerability is documented as CVE-2026-63183. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in OmniAuth up to 2.1.x. It has been rated as critical. This issue affects some unknown processing of the component Provider Callback URL Derivation. The manipulation with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-63183 since 07/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

Upgrading to version 2.2.0 eliminates this vulnerability.

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Productinfo

Name

• OmniAuth

Version

• 2.0
• 2.1

Website

• Product: https://github.com/omniauth/omniauth/

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CPE 2.2info

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