{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:zulip:zulip_server:10.0:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "12.0"
              },
              {
                "introduced": "10.0"
              },
              {
                "last_affected": "10.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_STRING"
            ]
          },
          "events": [
            {
              "introduced": "df1abeb8ed5f51d6e93114385ec637af9325962f"
            },
            {
              "fixed": "66114d404aeda6f3da1267469f3a5347acc8263a"
            }
          ],
          "repo": "https://github.com/zulip/zulip",
          "type": "GIT"
        }
      ],
      "versions": [
        "10.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-jp8f-mvv6-89cr"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-284"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40300.json"
  },
  "details": "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to 12.0, With message_edit_history_visibility_policy set to \"moves\", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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.",
  "id": "CVE-2026-40300",
  "modified": "2026-08-12T03:51:29.152562181Z",
  "published": "2026-05-12T16:33:02.829Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40300.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40300"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Zulip: Message edit history visible in \"moves only\" policy through /api/v1/messages/{id}/history"
}