FKIE_CVE-2026-35540

Vulnerability from fkie_nvd - Published: 2026-04-03 05:16 - Updated: 2026-04-07 20:52
Severity ?
5.4 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Summary
An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.
References
cve@mitre.orghttps://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870Patch
cve@mitre.orghttps://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942Patch
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 *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AF4B6448-D4F5-4680-B32C-9366630E9485",
              "versionEndExcluding": "1.6.14",
              "versionStartIncluding": "1.6.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts."
    }
  ],
  "id": "CVE-2026-35540",
  "lastModified": "2026-04-07T20:52:15.220",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 2.7,
        "source": "cve@mitre.org",
        "type": "Secondary"
      },
      {
        "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": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-04-03T05:16:22.100",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942"
    },
    {
      "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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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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