EUVD-2026-41686
GHSA-3f6x-q3gv-gmfc
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Network-delivered, no attacker privileges required (PR:N), but victim must visit crafted URL (UI:R); account takeover crosses scope boundary (S:C) with full confidentiality and integrity loss, no availability impact.
Primary rating from Vendor (CNA).
CVSS VectorVendor
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Lifecycle Timeline
2Description PRE-NVD
AnalysisAI
Login CSRF via a missing OAuth 2.0 state parameter in Dancer2::Plugin::Auth::OAuth::Provider (all versions before 0.23) allows a remote, unauthenticated attacker to associate their own OAuth provider identity and access token with a victim's application session, potentially achieving persistent account takeover. The plugin's authentication_url method never generates a state value, and the callback handler never validates one, leaving the entire authorization flow unbound to the session that initiated it. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target application must be running Dancer2::Plugin::Auth::OAuth::Provider at a version before 0.23 and must use it as an OAuth 2.0 login or account-linking mechanism. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | No CVSS vector was supplied by the advisory or NVD for this CVE, so all metric assessments are independently derived from the description. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker initiates a legitimate OAuth 2.0 authorization flow against the target Dancer2 application using their own provider account, capturing the resulting callback URL that contains the authorization code. The attacker then delivers this callback URL to a victim via phishing or a crafted web page, causing the victim's browser to visit it while holding an active application session. … |
| Remediation | Upgrade Dancer2-Plugin-Auth-OAuth to version 0.23 or later via CPAN (cpanm Dancer2::Plugin::Auth::OAuth or cpan Dancer2-Plugin-Auth-OAuth). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all applications using Dancer2::Plugin::Auth::OAuth::Provider and assess which are accessible from the internet. …
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Same weakness CWE-352 – Cross-Site Request Forgery (CSRF)
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External POC / Exploit Code
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