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    CVE-2026-25885

    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.

    Published:Feb 9, 2026
    Last Modified:Apr 17, 2026
    EPS:Feb 9, 2026
    EPSS Score:0.00054
    CVSS Score:7.5

    Affected Products

    Vendor
    Polarlearn
    Product
    Polarlearn
    Vendor
    Polarnl
    Product
    Polarlearn

    Exploits

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

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
    CAPEC-104 Cross Zone Scripting
    CAPEC-12 Choosing Message Identifier
    CAPEC-127 Directory Indexing
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-166 Force the System to Reset Values
    CAPEC-17 Using Malicious Files
    CAPEC-216 Communication Channel Manipulation
    CAPEC-36 Using Unpublished Interfaces or Functionality
    CAPEC-39 Manipulating Opaque Client-based Data Tokens
    CAPEC-402 Bypassing ATA Password Security
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-5 Blue Boxing
    CAPEC-51 Poison Web Service Registry
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-62 Cross Site Request Forgery
    CAPEC-647 Collect Data from Registries
    CAPEC-668 Key Negotiation of Bluetooth Attack (KNOB)
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-77 Manipulating User-Controlled Variables
    CAPEC-87 Forceful Browsing

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High