Security advisory

{
  "id": "333b8bd19feba1bfef613f7b26a798d28d1d73d6ee9f38e5f819014a6f5116f7",
  "url": "https://osv.dev/vulnerability/CVE-2021-23899",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-23899",
    "summary": "OWASP json-sanitizer before 1.2.2 may emit closing SCRIPT tags and CDATA section delimiters for crafted input. This allows an attacker to inject arbitrary HTML or XML into embedding documents.",
    "evidence": "osv:CVE-2021-23899",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-23899",
      "aliases": [
        "CVE-2021-23899",
        "GHSA-mm8j-9x84-m9cv"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/owasp/json-sanitizer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c999c7f93096f927273c87bf439d7a992e3a39dc"
                },
                {
                  "fixed": "a37f594f7378a1c76b3283e0dab9e1ab1dc0247e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:owasp:json-sanitizer:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.2.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a37f594f7378a1c76b3283e0dab9e1ab1dc0247e"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.2.1",
            "json-sanitizer-1.1",
            "json-sanitizer-1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-23899.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-23899-64d45075",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
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                },
                "source": "https://github.com/owasp/json-sanitizer/commit/a37f594f7378a1c76b3283e0dab9e1ab1dc0247e",
                "target": {
                  "file": "src/test/java/com/google/json/JsonSanitizerTest.java"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-23899-6ec1aa4c",
                "digest": {
                  "length": 857,
                  "function_hash": "105576089061181633384202976764767995078"
                },
                "source": "https://github.com/owasp/json-sanitizer/commit/a37f594f7378a1c76b3283e0dab9e1ab1dc0247e",
                "target": {
                  "file": "src/test/java/com/google/json/FuzzyTest.java",
                  "function": "testSanitizerLikesFuzzyWuzzyInputs"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-23899-f59aed4b",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
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                },
                "source": "https://github.com/owasp/json-sanitizer/commit/a37f594f7378a1c76b3283e0dab9e1ab1dc0247e",
                "target": {
                  "file": "src/test/java/com/google/json/FuzzyTest.java"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:18:24Z"
          }
        }
      ],
      "modified": "2026-10-20T14:18:24.430449098Z",
      "provider": "osv",
      "references": [
        "https://groups.google.com/g/json-sanitizer-support/c/dAW1AeNMoA0",
        "https://github.com/OWASP/json-sanitizer/commit/a37f594f7378a1c76b3283e0dab9e1ab1dc0247e",
        "https://github.com/OWASP/json-sanitizer/compare/v1.2.1...v1.2.2"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-23899",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388796,
  "published_at": "2021-01-13T16:15:14.413+00:00"
}