# CVE-2026-25885

## Summary

- **CVE ID:** CVE-2026-25885
- **Severity:** CRITICAL
- **CVSS Score:** 10 (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)
- **CWE:** CWE-285, CWE-306
- **Published:** Feb 9, 2026
- **Last Modified:** Mar 12, 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.

## Affected Products

- polarnl — PolarLearn (< 0-PRERELEASE-16)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._