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8.1
CVE-2026-12746: Dancer2::Plugin::Auth::OAuth: OAuth login vulnerable to account takeover
CVE-2026-12746
CVE-2026-12746
Summary
If you use this plugin for OAuth login, an attacker can hijack your users' accounts by tricking them into completing an authorization request started by the attacker. This can happen if an attacker convinces a user to click on a malicious link that redirects to the login page. To fix this, update to Dancer2::Plugin::Auth::OAuth::Provider version 0.23 or later.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| biafra | dancer2::plugin::auth::oauth::provider | < 0.23 |
Original title
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 ...
Original description
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.
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 type
CWE-352
Cross-Site Request Forgery (CSRF)
Published: 4 Jul 2026 · Updated: 7 Jul 2026 · First seen: 4 Jul 2026