ubuntu-cve-2026-35540
Vulnerability from osv_ubuntu
Published
2026-04-03 05:16
Modified
2026-06-30 12:04
Summary
Details

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.

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
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "roundcube",
            "binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
          },
          {
            "binary_name": "roundcube-core",
            "binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
          },
          {
            "binary_name": "roundcube-mysql",
            "binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
          },
          {
            "binary_name": "roundcube-pgsql",
            "binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
          },
          {
            "binary_name": "roundcube-plugins",
            "binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
          },
          {
            "binary_name": "roundcube-sqlite3",
            "binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "roundcube",
        "purl": "pkg:deb/ubuntu/roundcube@1.2~beta+dfsg.1-0ubuntu1+esm8?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.1+dfsg.1-2",
        "1.1.2+dfsg.1-5",
        "1.1.3+dfsg.1-1",
        "1.1.4+dfsg.1-1",
        "1.2~beta+dfsg.1-0ubuntu1",
        "1.2~beta+dfsg.1-0ubuntu1+esm1",
        "1.2~beta+dfsg.1-0ubuntu1+esm2",
        "1.2~beta+dfsg.1-0ubuntu1+esm3",
        "1.2~beta+dfsg.1-0ubuntu1+esm4",
        "1.2~beta+dfsg.1-0ubuntu1+esm5",
        "1.2~beta+dfsg.1-0ubuntu1+esm6",
        "1.2~beta+dfsg.1-0ubuntu1+esm7",
        "1.2~beta+dfsg.1-0ubuntu1+esm8"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "roundcube",
            "binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-core",
            "binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-mysql",
            "binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-pgsql",
            "binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-plugins",
            "binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-sqlite3",
            "binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "roundcube",
        "purl": "pkg:deb/ubuntu/roundcube@1.3.6+dfsg.1-1ubuntu0.1~esm8?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.0+dfsg.1-1",
        "1.3.1+dfsg.1-1",
        "1.3.3+dfsg.1-1",
        "1.3.3+dfsg.1-2",
        "1.3.6+dfsg.1-1",
        "1.3.6+dfsg.1-1ubuntu0.1~esm1",
        "1.3.6+dfsg.1-1ubuntu0.1~esm2",
        "1.3.6+dfsg.1-1ubuntu0.1~esm3",
        "1.3.6+dfsg.1-1ubuntu0.1~esm4",
        "1.3.6+dfsg.1-1ubuntu0.1~esm5",
        "1.3.6+dfsg.1-1ubuntu0.1~esm6",
        "1.3.6+dfsg.1-1ubuntu0.1~esm7",
        "1.3.6+dfsg.1-1ubuntu0.1~esm8"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "roundcube",
            "binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-core",
            "binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-mysql",
            "binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-pgsql",
            "binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-plugins",
            "binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
          },
          {
            "binary_name": "roundcube-sqlite3",
            "binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "roundcube",
        "purl": "pkg:deb/ubuntu/roundcube@1.4.3+dfsg.1-1ubuntu0.1~esm8?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.8+dfsg.1-2",
        "1.3.10+dfsg.1-1",
        "1.4.1+dfsg.1-2",
        "1.4.2+dfsg.1-1",
        "1.4.2+dfsg.1-2",
        "1.4.3+dfsg.1-1",
        "1.4.3+dfsg.1-1ubuntu0.1~esm1",
        "1.4.3+dfsg.1-1ubuntu0.1~esm2",
        "1.4.3+dfsg.1-1ubuntu0.1~esm3",
        "1.4.3+dfsg.1-1ubuntu0.1~esm4",
        "1.4.3+dfsg.1-1ubuntu0.1~esm5",
        "1.4.3+dfsg.1-1ubuntu0.1~esm6",
        "1.4.3+dfsg.1-1ubuntu0.1~esm7",
        "1.4.3+dfsg.1-1ubuntu0.1~esm8"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "roundcube",
            "binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
          },
          {
            "binary_name": "roundcube-core",
            "binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
          },
          {
            "binary_name": "roundcube-mysql",
            "binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
          },
          {
            "binary_name": "roundcube-pgsql",
            "binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
          },
          {
            "binary_name": "roundcube-plugins",
            "binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
          },
          {
            "binary_name": "roundcube-sqlite3",
            "binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "roundcube",
        "purl": "pkg:deb/ubuntu/roundcube@1.5.0+dfsg.1-2ubuntu0.1~esm6?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.11+dfsg.1-4",
        "1.5.0+dfsg.1-2",
        "1.5.0+dfsg.1-2ubuntu0.1~esm1",
        "1.5.0+dfsg.1-2ubuntu0.1~esm2",
        "1.5.0+dfsg.1-2ubuntu0.1~esm3",
        "1.5.0+dfsg.1-2ubuntu0.1~esm4",
        "1.5.0+dfsg.1-2ubuntu0.1~esm5",
        "1.5.0+dfsg.1-2ubuntu0.1~esm6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "roundcube",
            "binary_version": "1.6.6+dfsg-2ubuntu0.1+esm3"
          },
          {
            "binary_name": "roundcube-core",
            "binary_version": "1.6.6+dfsg-2ubuntu0.1+esm3"
          },
          {
            "binary_name": "roundcube-mysql",
            "binary_version": "1.6.6+dfsg-2ubuntu0.1+esm3"
          },
          {
            "binary_name": "roundcube-pgsql",
            "binary_version": "1.6.6+dfsg-2ubuntu0.1+esm3"
          },
          {
            "binary_name": "roundcube-plugins",
            "binary_version": "1.6.6+dfsg-2ubuntu0.1+esm3"
          },
          {
            "binary_name": "roundcube-sqlite3",
            "binary_version": "1.6.6+dfsg-2ubuntu0.1+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "roundcube",
        "purl": "pkg:deb/ubuntu/roundcube@1.6.6+dfsg-2ubuntu0.1+esm3?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.2+dfsg-1",
        "1.6.4+dfsg-1",
        "1.6.5+dfsg-1",
        "1.6.6+dfsg-1",
        "1.6.6+dfsg-2",
        "1.6.6+dfsg-2ubuntu0.1",
        "1.6.6+dfsg-2ubuntu0.1+esm1",
        "1.6.6+dfsg-2ubuntu0.1+esm2",
        "1.6.6+dfsg-2ubuntu0.1+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "roundcube",
            "binary_version": "1.6.11+dfsg-1"
          },
          {
            "binary_name": "roundcube-core",
            "binary_version": "1.6.11+dfsg-1"
          },
          {
            "binary_name": "roundcube-mysql",
            "binary_version": "1.6.11+dfsg-1"
          },
          {
            "binary_name": "roundcube-pgsql",
            "binary_version": "1.6.11+dfsg-1"
          },
          {
            "binary_name": "roundcube-plugins",
            "binary_version": "1.6.11+dfsg-1"
          },
          {
            "binary_name": "roundcube-sqlite3",
            "binary_version": "1.6.11+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "roundcube",
        "purl": "pkg:deb/ubuntu/roundcube@1.6.11+dfsg-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.10+dfsg-1",
        "1.6.10+dfsg-2",
        "1.6.11+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "roundcube",
            "binary_version": "1.6.11+dfsg-1ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "roundcube-core",
            "binary_version": "1.6.11+dfsg-1ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "roundcube-mysql",
            "binary_version": "1.6.11+dfsg-1ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "roundcube-pgsql",
            "binary_version": "1.6.11+dfsg-1ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "roundcube-plugins",
            "binary_version": "1.6.11+dfsg-1ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "roundcube-sqlite3",
            "binary_version": "1.6.11+dfsg-1ubuntu0.26.04.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "roundcube",
        "purl": "pkg:deb/ubuntu/roundcube@1.6.11+dfsg-1ubuntu0.26.04.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.11+dfsg-1",
        "1.6.11+dfsg-1ubuntu0.26.04.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "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": "UBUNTU-CVE-2026-35540",
  "modified": "2026-06-30T12:04:30Z",
  "published": "2026-04-03T05:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35540"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-35540"
    },
    {
      "type": "REPORT",
      "url": "https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14"
    },
    {
      "type": "REPORT",
      "url": "https://i0.rs/blog/turning-a-roundcube-link-tag-into-a-zero-day-ssrf-and-data-exfiltration/"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.14"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-35540"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.