Vulnerability · Published Feb 2, 2026 · Assigned by GitHub_M
CVE-2026-25221PolarLearn has Multiple Login CSRFs via Missing OAuth state Parameter (GitHub & Google)
Low 2.3
In plain English
A low-severity cross-site request forgery in PolarLearn from polarnl. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| polarnl | PolarLearn | <= v0-PRERELEASE-15 |
Weakness: CWE-352 · Vector: 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