Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') in GitLab

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-15723",
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "dateUpdated": "2026-10-21T23:35:15.434Z",
    "dateReserved": "2026-07-14T13:04:45.612Z",
    "datePublished": "2026-10-21T23:35:15.434Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab",
        "dateUpdated": "2026-10-21T23:35:15.434Z"
      },
      "title": "Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') in GitLab",
      "descriptions": [
        {
          "lang": "en",
          "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.1 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, when OmniAuth SAML and LDAP auto-linking were both enabled, an authenticated user could have taken over an existing LDAP-backed account without any interaction from the targeted user, due to improper input sanitization in the LDAP email lookup path used during OmniAuth identity linking."
        }
      ],
      "affected": [
        {
          "vendor": "GitLab",
          "product": "GitLab",
          "cpes": [
            "cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://gitlab.com/gitlab-org/gitlab",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "10.1",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "19.3.6"
            },
            {
              "version": "19.4",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "19.4.3"
            },
            {
              "version": "19.5",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "19.5.1"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-90: Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')",
              "cweId": "CWE-90",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/605977"
        },
        {
          "url": "https://hackerone.com/reports/3852192",
          "name": "HackerOne Bug Bounty Report #3852192",
          "tags": [
            "technical-description",
            "exploit",
            "permissions-required"
          ]
        },
        {
          "url": "https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/"
        }
      ],
      "metrics": [
        {
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ],
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "HIGH",
            "privilegesRequired": "LOW",
            "userInteraction": "NONE",
            "scope": "CHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "availabilityImpact": "NONE",
            "baseScore": 8.2,
            "baseSeverity": "HIGH"
          }
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to versions 19.3.6, 19.4.3, 19.5.1 or above."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Thanks [stealthy](https://hackerone.com/stealthy) for reporting this vulnerability through our HackerOne bug bounty program",
          "type": "finder"
        }
      ]
    }
  }
}