CVE-2026-25885

critical · 10

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

0.3%

EPSS (exploit prob.)

23rd

EPSS percentile

2026-02-09

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-285CWE-306

Affected products

Vendor	Product	Affected versions
polarlearn	polarlearn	all versions

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-25885