Group-Office: Authenticated Stored XSS in Administrator Context via Arbitrary Cross-User Setting Write_CVE-2026-45551

{
    "lastseen": "",
    "description": "Group-Office is an enterprise customer relationship management and groupware tool. Prior to 26.0.25, 25.0.100, and 6.8.165, GroupOffice allows authenticated users to persist arbitrary legacy settings for any user_id via index.php?r=core/saveSetting. A separate client-side sink in the email module injects the email_font_size setting directly into JavaScript without escaping. By combining these two issues, any low-privileged authenticated user can overwrite an administrator's email_font_size setting with a JavaScript payload and trigger stored XSS in the administrator's browser when the GroupOffice web client loads views/Extjs3/modulescripts.php. This vulnerability is fixed in 26.0.25, 25.0.100, and 6.8.165.",
    "published": "2026-05-29T12:34:22.615Z",
    "modified": "2026-05-29T13:16:31.397Z",
    "type": "cve",
    "title": "Group-Office: Authenticated Stored XSS in Administrator Context via Arbitrary Cross-User Setting Write",
    "source": "GitHub_M",
    "references": "https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p",
    "id": "CVE-2026-45551",
    "bulletinFamily": "",
    "cwe": [
        "CWE-79",
        "CWE-639"
    ],
    "cvelist": null,
    "sourceData": "Intermesh groupoffice >= 26.0.1, < 26.0.25\nIntermesh groupoffice >= 25.0.1, < 25.0.1005\nIntermesh groupoffice < 6.8.165",
    "sourceHref": "",
    "cvss": {
        "score": 5.1,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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": "groupoffice",
    "version": ">= 26.0.1, < 26.0.25",
    "vendor": "Intermesh",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}