CVE-2026-25885

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79f	Patch
https://github.com/polarnl/PolarLearn/security/advisories/GHSA-gvjm-5pw7-6c8c	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:polarlearn:polarlearn:-:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-02-09 22:16

Updated : 2026-02-20 20:47

NVD link : CVE-2026-25885

Mitre link : CVE-2026-25885

CVE.ORG link : CVE-2026-25885

JSON object : View

Products Affected

polarlearn

polarlearn

CWE

CWE-285

Improper Authorization

CWE-306

Missing Authentication for Critical Function

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