Misskey has a login rate limit bypass via spoofed X-Forwarded-For header_CVE-2025-66482

{
    "lastseen": "",
    "description": "Misskey is an open source, federated social media platform. Attackers who use an untrusted reverse proxy or not using a reverse proxy at all can bypass IP rate limiting by adding a forged X-Forwarded-For header. Starting with version 2025.9.1, an option (`trustProxy`) has been added in config file to prevent this from happening. However, it is initialized with an insecure default value before version 2025.12.0-alpha.2, making it still vulnerable if the configuration is not set correctly. This is patched in v2025.12.0-alpha.2 by flipping default value of `trustProxy` to `false`. Users of a trusted reverse proxy who are unsure if they manually overode this value should check their config for optimal behavior. Users are running Misskey with a trusted reverse proxy should not be affected by this vulnerability. From v2025.9.1 to v2025.11.1, workaround is available. Set `trustProxy: false` in config file.",
    "published": "2025-12-15T23:18:37.295Z",
    "modified": "2025-12-15T23:18:53.415Z",
    "type": "cve",
    "title": "Misskey has a login rate limit bypass via spoofed X-Forwarded-For header",
    "source": "GitHub_M",
    "references": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-wwrj-3hvj-prpm\nhttps://github.com/misskey-dev/misskey/commit/5512898463fa8487b9e6488912f35102b91f25f7",
    "id": "CVE-2025-66482",
    "bulletinFamily": "",
    "cwe": [
        "CWE-307",
        "CWE-1188"
    ],
    "cvelist": null,
    "sourceData": "misskey-dev misskey >= 2025.9.1, < 2025.12.0-alpha.2",
    "sourceHref": "",
    "cvss": {
        "score": 6.9,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/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": "misskey",
    "version": ">= 2025.9.1, < 2025.12.0-alpha.2",
    "vendor": "misskey-dev",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}