CVE-2026-39322 CRITICAL

CVE-2026-39322: PolarLearn: Any password authenticates banned accounts and grants API access

Vendor Polarnl
Product PolarLearn
Weakness CWE-287 · Improper authentication
Published April 7, 2026
Last update April 9, 2026

CVSS base score

9.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 7, 2026 CVE published
April 9, 2026 Record updated