CVE-2026-25221: low-severity vulnerability in polarnl PolarLearn
PolarLearn has Multiple Login CSRFs via Missing OAuth state Parameter (GitHub & Google)
Published · Updated
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8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 2.3epss 0.2%
PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, the OAuth 2.0 implementation for GitHub and Google login providers is vulnerable to Login Cross-Site Request Forgery (CSRF). The application fails to implement and verify the state parameter during the authentication flow. This allows an attacker to pre-authenticate a session and trick a victim into logging into the attacker's account. Any data the victim then enters or academic progress they make is stored on the attacker's account, leading to data loss for the victim and information disclosure to the attacker.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Affected products
polarnl · PolarLearnRelated CVEs — polarnl PolarLearn
In the same product, most dangerous first.
CVE-2026-25222MEDIUMPolarLearn Affected by User Enumeration via Argon2 Timing Attack on Sign-In EndpointEPSS 0.5%CVE-2026-25126HIGHPolarLearn's unvalidated vote direction allows vote count manipulationEPSS 0.4%CVE-2026-25885CRITICALPolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chatsEPSS 0.3%CVE-2026-35610HIGHPolarLearn has a Server Action Admin Bypass in Account Management ActionsEPSS 0.3%CVE-2026-39322CRITICALPolarLearn: Any password authenticates banned accounts and grants API accessEPSS 0.2%