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TI-2026-28311 Aliases CVE-2026-39322

PolarLearn: Any password authenticates banned accounts and grants API access

Priority MEDIUM 41CWE-287Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00243 15th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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-2026-39322

References

Advisory 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-2026-20371 PolarLearn has Multiple Login CSRFs via Missing OAuth state Parameter (GitHub & Google) CVSS 4.0LOW 2.3
  • 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