continuwuity Has an Unintended Proxy or Intermediary and Improper Input Validation_CVE-2025-68667

{
    "lastseen": "",
    "description": "continuwuity is a Matrix homeserver written in Rust. Prior to version 0.5.0, this vulnerability allows a remote, unauthenticated attacker to force the target server to cryptographically sign arbitrary membership events. The flaw exists because the server fails to validate the origin of a signing request, provided the event's state_key is a valid user ID belonging to the target server. This issue has been patched in version 0.5.0. A workaround for this issue involves blocking access to the PUT /_matrix/federation/v2/invite/{roomId}/{eventId} endpoint using the reverse proxy.",
    "published": "2025-12-23T22:45:25.958Z",
    "modified": "2025-12-23T22:45:25.958Z",
    "type": "cve",
    "title": "continuwuity Has an Unintended Proxy or Intermediary and Improper Input Validation",
    "source": "GitHub_M",
    "references": "https://github.com/continuwuity/continuwuity/security/advisories/GHSA-22fw-4jq7-g8r8\nhttps://forgejo.ellis.link/continuwuation/continuwuity/commit/7fa4fa98628593c1a963f5aa8dbc3657d604b047\nhttps://forgejo.ellis.link/continuwuation/continuwuity/commit/b2bead67ac8bc45de9a612578f295e5b7fc6c2b5",
    "id": "CVE-2025-68667",
    "bulletinFamily": "",
    "cwe": [
        "CWE-20",
        "CWE-441"
    ],
    "cvelist": null,
    "sourceData": "continuwuity continuwuity < 0.5.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.9,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:L/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": "continuwuity",
    "version": "< 0.5.0",
    "vendor": "continuwuity",
    "ai_description": "A remote, unauthenticated attacker can force the target server to cryptographically sign arbitrary membership events due to the server's failure to validate the origin of a signing request.",
    "ai_severity": "Critical",
    "ai_vendor": "continuwuity",
    "ai_product": "continuwuity",
    "ai_version": "< 0.5.0",
    "ai_score": 9.9
}