CVE-2026-12740
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
The vulnerability in the Plack::Middleware::OAuth library for Perl (versions up to 0.10) is due to missing support for the OAuth 2.0 state parameter. The authorization request does not generate a unique identifier, and the callback code verification does not check if it originates from the same session, enabling login CSRF attacks.
Risk Assessment
An attacker can exploit this flaw to hijack a victim's session by substituting their own OAuth provider account, leading to unauthorized access to the victim's account in the application, and if the account link is persisted, permanent access for the attacker.
Recommendation
Immediately update the Plack::Middleware::OAuth library to a version above 0.10 that implements the OAuth 2.0 state parameter, or apply an alternative solution that ensures session binding to the authorization request.
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Original NVD description (English source)
Plack::Middleware::OAuth versions through 0.10 for Perl do not support the OAuth 2.0 state parameter. RequestTokenV2 builds the provider authorization redirect without issuing a state value, and AccessTokenV2 exchanges the callback code and registers the resulting token into the session (register_session) without verifying that the callback corresponds to an authorization request this session initiated. Any application that uses this middleware 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.