CVE-2026-39322: critical vulnerability in polarnl PolarLearn
PolarLearn: Any password authenticates banned accounts and grants API access
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.2epss 0.2%
PolarLearn is a free and open-source learning program. In 0-PRERELEASE-15 and earlier, POST /api/v1/auth/sign-in creates a valid session for banned accounts before verifying the supplied password. That session is then accepted across authenticated /api routes, enabling account data access and authenticated actions as the banned user.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/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-2026-25221LOWPolarLearn has Multiple Login CSRFs via Missing OAuth state Parameter (GitHub & Google)EPSS 0.2%