CVE-2026-39322: Polarlearn

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Polarlearn Polarlearn: affected versions not specified

Published 2026-04-07. Last modified 2026-07-24.