Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in GitLab

{
  "id": "f645b8f81881bdc11d73431feef5de5c4bdd9bc243ceb2ec763aac401cf31d5e",
  "url": "https://osv.dev/vulnerability/CVE-2026-2995",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in GitLab",
    "summary": "GitLab has remediated an issue in GitLab EE affecting all versions from 15.4 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to add email addresses to targeted user accounts due to improper sanitization of HTML content.",
    "evidence": "osv:CVE-2026-2995",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-2995",
      "aliases": [
        "BIT-gitlab-2026-2995",
        "CVE-2026-2995"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/gitlab-org/gitlab",
              "type": "GIT",
              "events": [
                {
                  "introduced": "abbda55531f0a9d630eee1dcf2305ca499c94116"
                },
                {
                  "fixed": "bbb3a4b03698954b5a8efb0de7bafc061c303ed6"
                },
                {
                  "introduced": "20fe49b575fedd2b8cadc2c0640178879854aeb3"
                },
                {
                  "fixed": "d0161a9f097f49a9d33a4d8fe1d5a827ee777d67"
                },
                {
                  "introduced": "57c08314af5bc8f317b1967330f92ed029e2c628"
                },
                {
                  "last_affected": "57c08314af5bc8f317b1967330f92ed029e2c628"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "15.4.0"
                      },
                      {
                        "fixed": "18.8.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "18.9.0"
                      },
                      {
                        "fixed": "18.9.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:18.10.0:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "18.10.0"
                      },
                      {
                        "last_affected": "18.10.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "18.10.0",
            "v18.9.0-ee",
            "v18.10.0-ee"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2995.json"
          }
        }
      ],
      "modified": "2026-10-30T10:30:31.655581601Z",
      "provider": "osv",
      "references": [
        "https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/",
        "https://gitlab.com/gitlab-org/gitlab/-/work_items/591065",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2995.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-2995",
        "https://hackerone.com/reports/3564600"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-80"
        ],
        "cna_assigner": "GitLab",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "15.4"
                  },
                  {
                    "fixed": "18.8.7"
                  },
                  {
                    "introduced": "18.9"
                  },
                  {
                    "fixed": "18.9.3"
                  },
                  {
                    "introduced": "18.10"
                  },
                  {
                    "fixed": "18.10.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "15.4"
                  },
                  {
                    "fixed": "18.8.7"
                  },
                  {
                    "introduced": "18.9"
                  },
                  {
                    "fixed": "18.9.3"
                  },
                  {
                    "introduced": "18.10"
                  },
                  {
                    "fixed": "18.10.1"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2995.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-2995",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519527,
  "published_at": "2026-03-25T16:33:58.853+00:00"
}