Security advisory

{
  "id": "a443ff5142bc5faffe0d1696dea44e02a208ed41459414b17d746f5f4f85d9b4",
  "url": "https://osv.dev/vulnerability/CVE-2021-30458",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-30458",
    "summary": "An issue was discovered in Wikimedia Parsoid before 0.11.1 and 0.12.x before 0.12.2. An attacker can send crafted wikitext that Utils/WTUtils.php will transform by using a tag, bypassing sanitization steps, and potentially allowing for XSS.",
    "evidence": "osv:CVE-2021-30458",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-30458",
      "aliases": [
        "CVE-2021-30458",
        "GHSA-5pqx-77vf-85rw"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wikimedia/mediawiki-services-parsoid",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "682ac3f9f1381a3c2264d1eb0efbd3eba9e41608"
                },
                {
                  "introduced": "4062d23e3660fd34b2adc30a9b883f73415b1607"
                },
                {
                  "fixed": "15169a678f9f468ff6465035a32f28e8ec82003f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:wikimedia:parsoid:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.11.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:wikimedia:parsoid:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0.12.0"
                      },
                      {
                        "fixed": "0.12.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.11.0",
            "v0.12.1",
            "v0.12.0",
            "v0.10.0",
            "v0.8.0",
            "v0.9.0",
            "v0.7.1",
            "v0.7.0",
            "v0.6.1",
            "v0.6.0",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.1",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-30458.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:04.982059284Z",
      "provider": "osv",
      "references": [
        "https://security.gentoo.org/glsa/202107-40",
        "https://www.mediawiki.org/wiki/Parsoid",
        "https://phabricator.wikimedia.org/T279451"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-30458",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 440648,
  "published_at": "2021-04-09T07:15:16.34+00:00"
}