CVE-2026-25885

HighCVSS 7.5/10Last modified Jun 17, 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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-285 CWE-306

Affected software

No affected versions have been published.

Timeline

Published: Feb 9, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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