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.
History

Fri, 20 Feb 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Polarlearn
Polarlearn polarlearn
CPEs cpe:2.3:a:polarlearn:polarlearn:-:*:*:*:*:*:*:*
Vendors & Products Polarlearn
Polarlearn polarlearn
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}


Tue, 10 Feb 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 10 Feb 2026 12:45:00 +0000

Type Values Removed Values Added
First Time appeared Polarnl
Polarnl polarlearn
Vendors & Products Polarnl
Polarnl polarlearn

Mon, 09 Feb 2026 21:30:00 +0000

Type Values Removed Values Added
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.
Title PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats
Weaknesses CWE-285
CWE-306
References
Metrics cvssV4_0

{'score': 10, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-10T15:58:03.240Z

Reserved: 2026-02-06T21:08:39.129Z

Link: CVE-2026-25885

cve-icon Vulnrichment

Updated: 2026-02-10T15:39:33.292Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-09T22:16:03.583

Modified: 2026-02-20T20:47:36.330

Link: CVE-2026-25885

cve-icon Redhat

No data.