ubuntu-cve-2020-27783
Vulnerability from osv_ubuntu
Published
2020-12-03 17:15
Modified
2025-12-19 16:53
Summary
Details

A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.

Severity
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "python-lxml",
            "binary_version": "3.3.3-1ubuntu0.2+esm2"
          },
          {
            "binary_name": "python3-lxml",
            "binary_version": "3.3.3-1ubuntu0.2+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "lxml",
        "purl": "pkg:deb/ubuntu/lxml@3.3.3-1ubuntu0.2+esm2?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.3-1ubuntu0.2+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.0-1",
        "3.3.0~beta2-1",
        "3.3.0~beta4-1",
        "3.3.1-1",
        "3.3.2-1",
        "3.3.2-1build1",
        "3.3.3-1",
        "3.3.3-1ubuntu0.1",
        "3.3.3-1ubuntu0.2",
        "3.3.3-1ubuntu0.2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-lxml",
            "binary_version": "3.5.0-1ubuntu0.3"
          },
          {
            "binary_name": "python3-lxml",
            "binary_version": "3.5.0-1ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "lxml",
        "purl": "pkg:deb/ubuntu/lxml@3.5.0-1ubuntu0.3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.0-1ubuntu0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.4-1",
        "3.5.0-1",
        "3.5.0-1build1",
        "3.5.0-1ubuntu0.1",
        "3.5.0-1ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-lxml",
            "binary_version": "4.2.1-1ubuntu0.3"
          },
          {
            "binary_name": "python3-lxml",
            "binary_version": "4.2.1-1ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "lxml",
        "purl": "pkg:deb/ubuntu/lxml@4.2.1-1ubuntu0.3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.1-1ubuntu0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.0-1",
        "4.1.0-1",
        "4.2.0-1",
        "4.2.1-1",
        "4.2.1-1ubuntu0.1",
        "4.2.1-1ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python-lxml",
            "binary_version": "4.5.0-1ubuntu0.2"
          },
          {
            "binary_name": "python3-lxml",
            "binary_version": "4.5.0-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "lxml",
        "purl": "pkg:deb/ubuntu/lxml@4.5.0-1ubuntu0.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.5.0-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.4.1-1",
        "4.4.1-1build1",
        "4.4.2-1",
        "4.5.0-1",
        "4.5.0-1ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "A XSS vulnerability was discovered in python-lxml\u0027s clean module. The module\u0027s parser didn\u0027t properly imitate browsers, which caused different behaviors between the sanitizer and the user\u0027s page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.",
  "id": "UBUNTU-CVE-2020-27783",
  "modified": "2025-12-19T16:53:16Z",
  "published": "2020-12-03T17:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-27783"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lxml/lxml/commit/89e7aad6e7ff9ecd88678ff25f885988b184b26e"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4666-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4666-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-27783"
    }
  ],
  "related": [
    "USN-4666-1",
    "USN-4666-2"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-27783"
  ]
}



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