Security advisory

{
  "id": "9639cdd0de4191a49d77f21406169c9798e0e954ac35e3f03d6b932c7add637f",
  "url": "https://osv.dev/vulnerability/CVE-2021-39887",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-39887",
    "summary": "A stored Cross-Site Scripting vulnerability in the GitLab Flavored Markdown in GitLab CE/EE version 8.4 and above allowed an attacker to execute arbitrary JavaScript code on the victim's behalf.",
    "evidence": "osv:CVE-2021-39887",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-39887",
      "aliases": [
        "BIT-gitlab-2021-39887",
        "CVE-2021-39887"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/gitlab-org/gitlab",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5b5777b8cf3328d27ef549c31f70993da1d1b267"
                },
                {
                  "fixed": "9cd657e5179e339171d27e4573b8f5711db1d824"
                },
                {
                  "introduced": "38bbb40bb77dd3e0f0281c4363e2ef298e650c42"
                },
                {
                  "fixed": "72c1da0383a35604f4b2d73a7ed8e6a2c4ee64b1"
                },
                {
                  "introduced": "dec73e99fddac59c0bf816dc4bffd2a30abae6de"
                },
                {
                  "fixed": "0816e4664224c86a9c3868127ad890d7cf0526c6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "8.4.0"
                      },
                      {
                        "fixed": "14.1.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "8.4.0"
                      },
                      {
                        "fixed": "14.1.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "14.2"
                      },
                      {
                        "fixed": "14.2.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "14.2"
                      },
                      {
                        "fixed": "14.2.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "14.3"
                      },
                      {
                        "fixed": "14.3.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "14.3"
                      },
                      {
                        "fixed": "14.3.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v14.2.4-ee",
            "v14.3.0-ee",
            "v14.2.3-ee",
            "v14.2.1-ee",
            "v14.2.0-ee"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39887.json"
          }
        }
      ],
      "modified": "2026-10-30T10:30:17.009819748Z",
      "provider": "osv",
      "references": [
        "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39887.json",
        "https://gitlab.com/gitlab-org/gitlab/-/issues/332903",
        "https://hackerone.com/reports/1218174"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-39887",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 438025,
  "published_at": "2021-10-05T12:15:07.903+00:00"
}