CVE-2026-25885 | PolarLearn is a free and open-source learning program. In 0-… | CVSS 10.0 CRITICAL

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.

Metadata

CVE ID: CVE-2026-25885
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-02-06 21:08 UTC
Published: 2026-02-09 21:15 UTC
Last updated: 2026-02-10 15:58 UTC
Primary CWE: CWE-285
CWE-285: Improper Authorization
Vendor / Product: polarnl / PolarLearn
Sources: cve.org · NVD

Severity & Metrics

10.0 CRITICAL CVSS 4.0

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
polarnl	PolarLearn	—	< 0-PRERELEASE-16

Weakness (CWE)

CWE	Source	Description
CWE-285	cna	CWE-285: Improper Authorization
CWE-306	cna	CWE-306: Missing Authentication for Critical Function

CVSS scores (1)

Score	Severity	Version	Source	Vector
10.0	CRITICAL	4.0	cna	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

References (2)

https://github.com/polarnl/PolarLearn/security/advisories/GHSA-gvjm-5pw7-6c8c https://github.com/polarnl/PolarLearn/security/advisories/GHSA-gvjm-5pw7-6c8c
https://github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79f https://github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79f