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CVE-2026-12910 (GCVE-0-2026-12910)

Vulnerability from cvelistv5 – Published: 2026-09-15 17:36 – Updated: 2026-09-15 17:36
VLAI
Title
Missing Authentication for Critical Function in GitLab
Summary
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.6 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could have allowed an authenticated user to bypass SAML SSO sign-in restrictions and authenticate without SSO due to missing authentication enforcement checks.
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
References
URL Tags
https://gitlab.com/gitlab-org/gitlab/-/work_items…
https://hackerone.com/reports/3745561 technical-descriptionexploitpermissions-required
Impacted products
Vendor Product Version CPE status
GitLab GitLab Affected: 18.6 , < 19.1.8 (semver)
Affected: 19.2 , < 19.2.6 (semver)
Affected: 19.3 , < 19.3.2 (semver)
    cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Thanks [theluci](https://hackerone.com/theluci) for reporting this vulnerability through our HackerOne bug bounty program
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "product": "GitLab",
          "repo": "git://git@gitlab.com:gitlab-org/gitlab.git",
          "vendor": "GitLab",
          "versions": [
            {
              "lessThan": "19.1.8",
              "status": "affected",
              "version": "18.6",
              "versionType": "semver"
            },
            {
              "lessThan": "19.2.6",
              "status": "affected",
              "version": "19.2",
              "versionType": "semver"
            },
            {
              "lessThan": "19.3.2",
              "status": "affected",
              "version": "19.3",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Thanks [theluci](https://hackerone.com/theluci) for reporting this vulnerability through our HackerOne bug bounty program"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.6 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could have allowed an authenticated user to bypass SAML SSO sign-in restrictions and authenticate without SSO due to missing authentication enforcement checks."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-306",
              "description": "CWE-306: Missing Authentication for Critical Function",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T17:36:06.594Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/603742"
        },
        {
          "name": "HackerOne Bug Bounty Report #3745561",
          "tags": [
            "technical-description",
            "exploit",
            "permissions-required"
          ],
          "url": "https://hackerone.com/reports/3745561"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to versions 19.1.8, 19.2.6, 19.3.2 or above."
        }
      ],
      "title": "Missing Authentication for Critical Function in GitLab"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2026-12910",
    "datePublished": "2026-09-15T17:36:06.594Z",
    "dateReserved": "2026-06-22T15:33:41.496Z",
    "dateUpdated": "2026-09-15T17:36:06.594Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-12910\",\"sourceIdentifier\":\"cve@gitlab.com\",\"published\":\"2026-09-15T18:17:16.000\",\"lastModified\":\"2026-09-15T18:17:16.000\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.6 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could have allowed an authenticated user to bypass SAML SSO sign-in restrictions and authenticate without SSO due to missing authentication enforcement checks.\"}],\"affected\":[{\"source\":\"cve@gitlab.com\",\"affectedData\":[{\"vendor\":\"GitLab\",\"product\":\"GitLab\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*\"],\"repo\":\"git://git@gitlab.com:gitlab-org/gitlab.git\",\"versions\":[{\"version\":\"18.6\",\"lessThan\":\"19.1.8\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"19.2\",\"lessThan\":\"19.2.6\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"19.3\",\"lessThan\":\"19.3.2\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cve@gitlab.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N\",\"baseScore\":5.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":2.5}]},\"weaknesses\":[{\"source\":\"cve@gitlab.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-306\"}]}],\"references\":[{\"url\":\"https://gitlab.com/gitlab-org/gitlab/-/work_items/603742\",\"source\":\"cve@gitlab.com\"},{\"url\":\"https://hackerone.com/reports/3745561\",\"source\":\"cve@gitlab.com\"}]}}"
  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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