CVE-2026-25885 — PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats
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. …
Published: 2026-02-09 · CVSS: 10.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7