Zulip: Message edit history visible in “moves only” policy through /api/v1/messages/{id}/history_CVE-2026-40300

{
    "lastseen": "",
    "description": "Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to \"moves\", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This vulnerability is fixed in 12.0.",
    "published": "2026-05-12T16:33:02.829Z",
    "modified": "2026-05-12T16:33:02.829Z",
    "type": "cve",
    "title": "Zulip: Message edit history visible in \"moves only\" policy through /api/v1/messages/{id}/history",
    "source": "GitHub_M",
    "references": "https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr",
    "id": "CVE-2026-40300",
    "bulletinFamily": "",
    "cwe": [
        "CWE-284"
    ],
    "cvelist": null,
    "sourceData": "zulip zulip < 12.0",
    "sourceHref": "",
    "cvss": {
        "score": 6,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "zulip",
    "version": "< 12.0",
    "vendor": "zulip",
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    "ai_score": 0
}