Unrated severityNVD Advisory· Published Feb 9, 2026· Updated Feb 10, 2026
PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats
CVE-2026-25885
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.
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Affected products
2<= 0-PRERELEASE-16+ 1 more
- (no CPE)range: <= 0-PRERELEASE-16
- (no CPE)range: < 0-PRERELEASE-16
Patches
Vulnerability mechanics
References
2- github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79fmitrex_refsource_MISC
- github.com/polarnl/PolarLearn/security/advisories/GHSA-gvjm-5pw7-6c8cmitrex_refsource_CONFIRM
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