CVE-2026-25885

CRITICAL EPSS 20.3%
Published Feb 9, 20264mo ago · Modified Jun 17, 20262w ago
10.0 CVSS 4.0
Critical
Find Similar
Published Feb 9, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
10.0
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
20.3% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-285
CWE-306 Missing Authentication for Critical Function Authentication

Affected Products 1

VendorProductVersionRange
polarlearnpolarlearn*any

References 2

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

Remediation

  • github.com https://github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79f
    Patch