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TI-2026-20371 Aliases CVE-2026-25221

PolarLearn has Multiple Login CSRFs via Missing OAuth state Parameter (GitHub & Google)

Priority MEDIUM 45CWE-352Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Tampering
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-352.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00231 14th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
polarnlPolarLearnup to v0-PRERELEASE-15—No fix listedCNA
  • PolarLearn Vendorpolarnl Affected up to v0-PRERELEASE-15 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:polarlearn:polarlearn:-:*:*:*:*:*:*:*not specified by NVDVulnerablepolarnl
  • cpe:2.3:a:polarlearn:polarlearn:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·polarnl

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25221

References

Exploit 1

Patch 1

  • TI-2026-27712 PolarLearn has a Server Action Admin Bypass in Account Management Actions CVSS 3.1HIGH 8.8
  • TI-2026-20372 PolarLearn Affected by User Enumeration via Argon2 Timing Attack on Sign-In Endpoint CVSS 4.0MEDIUM 6.3
  • TI-2026-20925 PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats CVSS 4.0CRITICAL 10.0
  • TI-2026-28311 PolarLearn: Any password authenticates banned accounts and grants API access CVSS 4.0CRITICAL 9.2
  • TI-2026-20289 PolarLearn's unvalidated vote direction allows vote count manipulation CVSS 3.1HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences