CVE-2026-25885
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Unauthenticated WebSocket Access Allows Message Injection in PolarLearn

Publication date: 2026-02-09

Last updated on: 2026-02-20

Assigner: GitHub, Inc.

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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Meta Information
Published
2026-02-09
Last Modified
2026-02-20
Generated
2026-06-16
AI Q&A
2026-02-10
EPSS Evaluated
2026-06-15
NVD
CVE-2026-25885
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
polarlearn polarlearn *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-285 The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
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Executive Summary

The vulnerability in PolarLearn versions 0-PRERELEASE-16 and earlier allows unauthenticated clients to access the group chat WebSocket at wss://polarlearn.nl/api/v1/ws without logging in.

An attacker can subscribe to any group chat by providing the group's UUID and can send messages to any group. The server accepts these messages and stores them in the group's chat content, meaning this is more than just a visual spam issue.

Impact Analysis

This vulnerability can lead to unauthorized access to group chats, allowing attackers to read and send messages without authentication.

Because messages sent by unauthenticated users are stored in the group chat content, this could lead to data integrity issues, unauthorized information disclosure, and potential disruption of communication within groups.

Compliance Impact

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