CVE-2026-39322: CWE-287: Improper Authentication in polarnl PolarLearn
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.
AI Analysis
Technical Summary
CVE-2026-39322 affects PolarLearn (<= v0-PRERELEASE-15) and involves improper authentication due to the POST /api/v1/auth/sign-in endpoint creating valid sessions for banned accounts prior to password verification. This allows attackers to bypass authentication controls and access or act as banned users across authenticated API routes. The vulnerability is categorized under CWE-287 and has a critical CVSS 4.0 score of 9.2, indicating high impact and exploitability over the network without user interaction or privileges.
Potential Impact
Successful exploitation allows attackers to authenticate as banned users without valid credentials, enabling unauthorized access to account data and the ability to perform authenticated actions. This compromises account integrity and confidentiality for banned users within PolarLearn instances running affected versions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to affected versions and consider disabling or restricting the vulnerable authentication endpoint if possible.
CVE-2026-39322: CWE-287: Improper Authentication in polarnl PolarLearn
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-39322 affects PolarLearn (<= v0-PRERELEASE-15) and involves improper authentication due to the POST /api/v1/auth/sign-in endpoint creating valid sessions for banned accounts prior to password verification. This allows attackers to bypass authentication controls and access or act as banned users across authenticated API routes. The vulnerability is categorized under CWE-287 and has a critical CVSS 4.0 score of 9.2, indicating high impact and exploitability over the network without user interaction or privileges.
Potential Impact
Successful exploitation allows attackers to authenticate as banned users without valid credentials, enabling unauthorized access to account data and the ability to perform authenticated actions. This compromises account integrity and confidentiality for banned users within PolarLearn instances running affected versions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to affected versions and consider disabling or restricting the vulnerable authentication endpoint if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-06T19:31:07.266Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d55f07aaed68159a56293e
Added to database: 4/7/2026, 7:46:15 PM
Last enriched: 4/15/2026, 12:25:14 PM
Last updated: 5/23/2026, 1:44:08 AM
Views: 56
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