CVE-2026-39322 PolarLearn: Any password authenticates banned accounts and grants API access
Attackers can authenticate banned accounts with any password to access API routes, allowing unauthorized data access and actions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39322?
CVE-2026-39322 is a critical authentication bypass vulnerability in polarnl PolarLearn, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-39322?
It affects 1 product.
Products include Polarlearn Polarlearn.
How do I fix CVE-2026-39322?
No fix has been published for CVE-2026-39322 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-39322 being exploited?
There is no known exploitation of CVE-2026-39322 in the wild and no public exploit code.
Other vulnerabilities in polarnl PolarLearn
- CVE-2026-25885 PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats
- CVE-2026-35610 PolarLearn has a Server Action Admin Bypass in Account Management Actions
- CVE-2026-25126 PolarLearn's unvalidated vote direction allows vote count manipulation
- CVE-2026-25222 PolarLearn Affected by User Enumeration via Argon2 Timing Attack on Sign-In Endpoint
- CVE-2026-25221 PolarLearn has Multiple Login CSRFs via Missing OAuth state Parameter (GitHub & Google)