{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "10.0.0"
              },
              {
                "fixed": "10.0.18"
              },
              {
                "introduced": "10.1.0"
              },
              {
                "fixed": "10.1.13"
              }
            ]
          },
          "events": [
            {
              "introduced": "b68c7b31a1d94f94903a79c53f1bd316b792de1d"
            },
            {
              "fixed": "c2fac09a3333bcb767866afa3203541da2e8729c"
            },
            {
              "introduced": "52b539ef205db233bfd8116e8130e27735b4153c"
            },
            {
              "fixed": "1884e94c76d9602c75dff36c9ff9a5ec2224c582"
            }
          ],
          "repo": "https://github.com/zimbra/zm-build",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.",
  "id": "CVE-2025-66376",
  "modified": "2026-04-01T23:09:37.521024006Z",
  "published": "2026-01-05T15:15:44.903Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376"
    },
    {
      "type": "ADVISORY",
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes"
    },
    {
      "type": "ADVISORY",
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes"
    },
    {
      "type": "ADVISORY",
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"
    },
    {
      "type": "ADVISORY",
      "url": "https://wiki.zimbra.com/wiki/Security_Center"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}