FKIE_CVE-2026-35544

Vulnerability from fkie_nvd - Published: 2026-04-03 05:16 - Updated: 2026-04-09 01:09
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.
References
cve@mitre.orghttps://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662Patch
cve@mitre.orghttps://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0Patch
cve@mitre.orghttps://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7Patch
cve@mitre.orghttps://github.com/roundcube/roundcubemail/releases/tag/1.5.14Release Notes
cve@mitre.orghttps://github.com/roundcube/roundcubemail/releases/tag/1.6.14Release Notes
cve@mitre.orghttps://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5Release Notes
cve@mitre.orghttps://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14Vendor Advisory
Impacted products
Vendor Product Version
roundcube webmail *
roundcube webmail *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8D54F615-2408-47CF-866C-93A7041665CD",
              "versionEndIncluding": "1.5.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "36D1025D-5F8E-405B-8788-0F8FEE30B3C9",
              "versionEndIncluding": "1.6.13",
              "versionStartIncluding": "1.6.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important."
    }
  ],
  "id": "CVE-2026-35544",
  "lastModified": "2026-04-09T01:09:00.530",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-03T05:16:22.810",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.5.14"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.14"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-669"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Primary"
    }
  ]
}


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