OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers_CVE-2026-53837

{
    "lastseen": "",
    "description": "OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata. Attackers can bypass intended DM policy decisions by sending crafted Mattermost events missing channel type information to process restricted content.",
    "published": "2026-06-12T21:57:00.613Z",
    "modified": "2026-06-12T21:57:00.613Z",
    "type": "cve",
    "title": "OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers",
    "source": "VulnCheck",
    "references": "https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh\nhttps://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers",
    "id": "CVE-2026-53837",
    "bulletinFamily": "",
    "cwe": [
        "CWE-636"
    ],
    "cvelist": null,
    "sourceData": "OpenClaw OpenClaw 0",
    "sourceHref": "",
    "cvss": {
        "score": 6.3,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
        "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": "OpenClaw",
    "version": "0",
    "vendor": "OpenClaw",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}