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.
CVSS v4.0
Score 9.2critical
Weaknesses
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: 04/07/2026, 19:46:15 UTC
Last enriched: 04/15/2026, 12:25:14 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 108
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.