Security advisory

{
  "id": "552aba6b89188192e2087dfb4717841f427a9d684dc8463765f7a00f56c19991",
  "url": "https://osv.dev/vulnerability/CVE-2026-48843",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-48843",
    "summary": "Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has 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. The issue stems from an insufficient fix for CVE-2026-35540.",
    "evidence": "osv:CVE-2026-48843",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-48843",
      "aliases": [
        "CVE-2026-48843"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/roundcube/roundcubemail",
              "type": "GIT",
              "events": [
                {
                  "introduced": "27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"
                },
                {
                  "fixed": "ea1798a6fbf060abcc0ba73b2435036bf8016a5a"
                },
                {
                  "introduced": "df9effa186f81d676962b941da4ebab5e05c3088"
                },
                {
                  "fixed": "d40ec266240f2456a52c24ef2848e18bbfb5c300"
                },
                {
                  "fixed": "ab96c88bfd888866ec5e02190b19618db283923a"
                },
                {
                  "fixed": "cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.6.14"
                      },
                      {
                        "fixed": "1.6.16"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.7.0"
                      },
                      {
                        "fixed": "1.7.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d40ec266240f2456a52c24ef2848e18bbfb5c300"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.7.1"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ab96c88bfd888866ec5e02190b19618db283923a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ea1798a6fbf060abcc0ba73b2435036bf8016a5a"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.6.16"
                  },
                  {
                    "range": [
                      {
                        "fixed": "cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.7.0",
            "1.6.15",
            "1.6.14"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48843.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.730058224Z",
      "provider": "osv",
      "references": [
        "https://github.com/roundcube/roundcubemail/releases/tag/1.6.16",
        "https://github.com/roundcube/roundcubemail/releases/tag/1.7.1",
        "https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48843.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-48843",
        "https://github.com/roundcube/roundcubemail/commit/ab96c88bfd888866ec5e02190b19618db283923a",
        "https://github.com/roundcube/roundcubemail/commit/cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48843.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-48843",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520318,
  "published_at": "2026-05-25T19:11:04.351+00:00"
}