CVE-2026-25885
PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats
- State
- Published
- Severity
- 10.0 Critical
- Published
- Feb 9, 2026
- Updated
- Feb 10, 2026
- Reserved
- Feb 6, 2026
Description
PolarLearn is a free and open-source learning program. In 0-PRERELEASE-16 and earlier, the group chat WebSocket at wss://polarlearn.nl/api/v1/ws can be used without logging in. An unauthenticated client can subscribe to any group chat by providing a group UUID, and can also send messages to any group. The server accepts the message and stores it in the group’s chatContent, so this is not just a visual spam issue.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 10.0 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
PolarLearnpolarnl |
|
References
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