PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats_CVE-2026-25885

{
    "lastseen": "",
    "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\u2019s chatContent, so this is not just a visual spam issue.",
    "published": "2026-02-09T21:15:33.419Z",
    "modified": "2026-02-09T21:15:33.419Z",
    "type": "cve",
    "title": "PolarLearn allows Unauthenticated WebSocket access allows subscribing to and posting in arbitrary group chats",
    "source": "GitHub_M",
    "references": "https://github.com/polarnl/PolarLearn/security/advisories/GHSA-gvjm-5pw7-6c8c\nhttps://github.com/polarnl/PolarLearn/commit/3ba588fda0d3f8e238483a20772719f27e52e79f",
    "id": "CVE-2026-25885",
    "bulletinFamily": "",
    "cwe": [
        "CWE-285",
        "CWE-306"
    ],
    "cvelist": null,
    "sourceData": "polarnl PolarLearn < 0-PRERELEASE-16",
    "sourceHref": "",
    "cvss": {
        "score": 10,
        "severity": "CRITICAL",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "PolarLearn",
    "version": "< 0-PRERELEASE-16",
    "vendor": "polarnl",
    "ai_description": "Unauthenticated access to group chats via WebSocket, allowing message subscription and posting",
    "ai_severity": "Critical",
    "ai_vendor": "polarnl",
    "ai_product": "PolarLearn",
    "ai_version": "0-PRERELEASE-16 and earlier",
    "ai_score": 10
}