Security advisory

{
  "id": "ce516cea9bbe48671eacd4ca754f3cfea82e2d0f98278a030fece2f224290d97",
  "url": "https://osv.dev/vulnerability/CVE-2026-35544",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-35544",
    "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.",
    "evidence": "osv:CVE-2026-35544",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-35544",
      "aliases": [
        "CVE-2026-35544",
        "GHSA-xpqh-grpw-4xmg"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/roundcube/roundcubemail",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "c15f5dbf093a497e19a749b20e7f8fb5a9c24cde"
                },
                {
                  "introduced": "993b888afe29c383bf45c84f17090f4db96367ba"
                },
                {
                  "fixed": "099009b9c8e1d3c636fb9a5af72f7c2596018662"
                },
                {
                  "fixed": "226811a1c974271dbedca72672923abaff8191c0"
                },
                {
                  "fixed": "57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7"
                },
                {
                  "fixed": "d742954ccbcdee7020f8f2e7c49ce0fca5a0efab"
                },
                {
                  "fixed": "27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"
                },
                {
                  "fixed": "8e4a99b0746577c2928f5ae984b3ab533b970ca0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.5.13"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.6.0"
                      },
                      {
                        "last_affected": "1.6.13"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "099009b9c8e1d3c636fb9a5af72f7c2596018662"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "226811a1c974271dbedca72672923abaff8191c0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d742954ccbcdee7020f8f2e7c49ce0fca5a0efab"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.5.14"
                  },
                  {
                    "range": [
                      {
                        "fixed": "27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.6.14"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8e4a99b0746577c2928f5ae984b3ab533b970ca0"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.7-rc5"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.7-rc4",
            "1.5.13",
            "1.6.13",
            "1.7-rc3",
            "1.7-rc2",
            "1.5.12",
            "1.6.12",
            "1.7-rc",
            "1.5.11",
            "1.7-beta2",
            "1.7-beta",
            "1.5.10",
            "1.6.11",
            "1.6.10",
            "1.5.9",
            "1.6.9",
            "1.5.8",
            "1.6.8",
            "1.5.7",
            "1.6.7",
            "1.6.6",
            "1.5.6",
            "1.6.5",
            "1.5.5",
            "1.6.4",
            "1.6.3",
            "1.5.4",
            "1.6.2",
            "1.6.1",
            "1.5.3",
            "1.6.0",
            "1.6-beta",
            "1.5.2",
            "1.5.1",
            "1.5.0",
            "1.5-rc",
            "1.5-beta",
            "1.4-rc2",
            "1.4-rc1",
            "1.4-beta",
            "1.3-beta",
            "1.2-rc",
            "1.2-beta",
            "1.1.0",
            "1.1-rc",
            "1.1-beta",
            "v0.1-beta2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35544.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.707474592Z",
      "provider": "osv",
      "references": [
        "https://github.com/roundcube/roundcubemail/releases/tag/1.5.14",
        "https://github.com/roundcube/roundcubemail/releases/tag/1.6.14",
        "https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5",
        "https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35544.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-35544",
        "https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662",
        "https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0",
        "https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-669"
        ],
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35544.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-35544",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 516870,
  "published_at": "2026-04-03T03:59:49.053+00:00"
}