CVE-2026-12746
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
Dancer2::Plugin::Auth::OAuth::Provider versions before 0.23 for Perl lack OAuth 2.0 state parameter support. The authentication_url method does not issue a state value, and the callback method does not verify the callback corresponds to the session's authorization request, enabling login CSRF attacks.
Risk Assessment
An attacker can exploit the missing state validation to bind a victim's session to the attacker's OAuth provider account, gaining persistent access to the victim's application account.
Recommendation
Upgrade Dancer2::Plugin::Auth::OAuth::Provider to version 0.23 or later, which implements the OAuth 2.0 state parameter.
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Original NVD description (English source)
Dancer2::Plugin::Auth::OAuth::Provider versions before 0.23 for Perl do not support the OAuth 2.0 state parameter. The authentication_url method builds the provider authorization redirect without issuing a state value, and the callback method exchanges the callback code and registers the resulting token into the session without verifying that the callback corresponds to an authorization request this session initiated. Any application that uses this plugin for OAuth 2.0 login is exposed to login cross-site request forgery: because the callback is not bound to the session that began the flow, an attacker who starts an authorization with their own provider account can deliver the resulting callback to a victim, causing the victim's session to complete the attacker's authorization and associating the attacker's provider identity and access token with that session. Where the application persists this as an account link, the attacker may retain access to the victim's account through their own provider credentials.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS