With MultiBlocks enabled and a user who is suppressed via a MultiBlock, a user without ‘hideuser’ can see the hidden username in the BlockList_CVE-2025-6589

{
    "lastseen": "",
    "description": "Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/specials/pagers/BlockListPager.Php.\n\nThis issue affects MediaWiki: >= 1.42.0.",
    "published": "2026-02-02T23:03:45.939Z",
    "modified": "2026-02-02T23:03:45.939Z",
    "type": "cve",
    "title": "With MultiBlocks enabled and a user who is suppressed via a MultiBlock, a user without 'hideuser' can see the hidden username in the BlockList",
    "source": "wikimedia-foundation",
    "references": "https://phabricator.wikimedia.org/T391343",
    "id": "CVE-2025-6589",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Wikimedia Foundation MediaWiki >= 1.42.0",
    "sourceHref": "",
    "cvss": {
        "score": 2.1,
        "severity": "LOW",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y",
        "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": "MediaWiki",
    "version": ">= 1.42.0",
    "vendor": "Wikimedia Foundation",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}