FKIE_CVE-2026-114722

Vulnerability from fkie_nvd - Published: 2026-10-22 02:17 - Updated: 2026-10-22 16:45
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Summary
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSS scoping bypass in HTML messages. rcube_utils::mod_css_styles() did not treat an at-rule prologue such as @layer a; as a selector boundary, and did not handle selectors beginning with ::, so selectors following an at-rule were left unscoped and applied to the whole Roundcube interface instead of being confined to the message body. This allows an HTML message to restyle application chrome for UI redressing and spoofing. Upstream fixed this in the commit “Fix CSS scoping bypass in HTML messages using at-rules”.
References
cve@mitre.orghttps://bugs.debian.org/1151279
cve@mitre.orghttps://github.com/roundcube/roundcubemail/commit/95b81ae12e2819a9b7e8636b5859b6244cda383e
cve@mitre.orghttps://github.com/roundcube/roundcubemail/commit/ff9cf4a9bf3b7c66db9afe43fe5f1cc73b47ed35
cve@mitre.orghttps://github.com/roundcube/roundcubemail/releases/tag/1.6.20
cve@mitre.orghttps://github.com/roundcube/roundcubemail/releases/tag/1.7.5
cve@mitre.orghttps://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Webmail",
          "repo": "https://github.com/roundcube/roundcubemail/",
          "vendor": "Roundcube",
          "versions": [
            {
              "lessThan": "1.6.20",
              "status": "affected",
              "version": "1.6.0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.7.5",
              "status": "affected",
              "version": "1.7.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSS scoping bypass in HTML messages. rcube_utils::mod_css_styles() did not treat an at-rule prologue such as @layer a; as a selector boundary, and did not handle selectors beginning with ::, so selectors following an at-rule were left unscoped and applied to the whole Roundcube interface instead of being confined to the message body. This allows an HTML message to restyle application chrome for UI redressing and spoofing. Upstream fixed this in the commit \u201cFix CSS scoping bypass in HTML messages using at-rules\u201d."
    }
  ],
  "id": "CVE-2026-114722",
  "lastModified": "2026-10-22T16:45:49.550",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-22T02:17:00.033",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://bugs.debian.org/1151279"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/roundcube/roundcubemail/commit/95b81ae12e2819a9b7e8636b5859b6244cda383e"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/roundcube/roundcubemail/commit/ff9cf4a9bf3b7c66db9afe43fe5f1cc73b47ed35"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.20"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7.5"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-669"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Primary"
    }
  ]
}



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