CVE-2023-6840 (GCVE-0-2023-6840)

Vulnerability from cvelistv5 – Published: 2024-02-07 22:02 – Updated: 2025-11-20 04:11
VLAI?
Summary
An issue has been discovered in GitLab EE affecting all versions from 16.4 prior to 16.6.7, 16.7 prior to 16.7.5, and 16.8 prior to 16.8.2 which allows a maintainer to change the name of a protected branch that bypasses the security policy added to block MR.
Severity ?
6.7 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H
CWE
Assigner
References
https://gitlab.com/gitlab-org/gitlab/-/issues/435500 issue-tracking
https://hackerone.com/reports/2280292 technical-descriptionexploitpermissions-required
Impacted products
Vendor Product Version
GitLab GitLab Affected: 16.4 , < 16.6.7 (semver)
Affected: 16.7 , < 16.7.5 (semver)
Affected: 16.8 , < 16.8.2 (semver)
    cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
 Create a notification for this product.
Credits
Thanks [js_noob](https://hackerone.com/js_noob) for reporting this vulnerability through our HackerOne bug bounty program
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-6840",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-12-18T17:54:46.828519Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-12-18T17:55:10.272Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T08:42:08.148Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "GitLab Issue #435500",
            "tags": [
              "issue-tracking",
              "x_transferred"
            ],
            "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/435500"
          },
          {
            "name": "HackerOne Bug Bounty Report #2280292",
            "tags": [
              "technical-description",
              "exploit",
              "x_transferred"
            ],
            "url": "https://hackerone.com/reports/2280292"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "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": "16.6.7",
              "status": "affected",
              "version": "16.4",
              "versionType": "semver"
            },
            {
              "lessThan": "16.7.5",
              "status": "affected",
              "version": "16.7",
              "versionType": "semver"
            },
            {
              "lessThan": "16.8.2",
              "status": "affected",
              "version": "16.8",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Thanks [js_noob](https://hackerone.com/js_noob) for reporting this vulnerability through our HackerOne bug bounty program"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue has been discovered in GitLab EE affecting all versions from 16.4 prior to 16.6.7, 16.7 prior to 16.7.5, and 16.8 prior to 16.8.2 which allows a maintainer to change the name of a protected branch that bypasses the security policy added to block MR."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862: Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-11-20T04:11:43.314Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "name": "GitLab Issue #435500",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://gitlab.com/gitlab-org/gitlab/-/issues/435500"
        },
        {
          "name": "HackerOne Bug Bounty Report #2280292",
          "tags": [
            "technical-description",
            "exploit",
            "permissions-required"
          ],
          "url": "https://hackerone.com/reports/2280292"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to versions 16.8.2, 16.7.5, 16.6.7 or above."
        }
      ],
      "title": "Missing Authorization in GitLab"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2023-6840",
    "datePublished": "2024-02-07T22:02:20.934Z",
    "dateReserved": "2023-12-15T12:02:46.848Z",
    "dateUpdated": "2025-11-20T04:11:43.314Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*\", \"versionStartIncluding\": \"16.4.0\", \"versionEndExcluding\": \"16.6.7\", \"matchCriteriaId\": \"5A1A9E0E-DFC2-4567-9218-6F7B9FE56F34\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*\", \"versionStartIncluding\": \"16.7.0\", \"versionEndExcluding\": \"16.7.5\", \"matchCriteriaId\": \"8ECA9350-B77B-41F6-B234-72BF47FD50E7\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*\", \"versionStartIncluding\": \"16.8.0\", \"versionEndExcluding\": \"16.8.2\", \"matchCriteriaId\": \"FDA190F8-0AAA-44DF-8A6B-A9A4380D478C\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"An issue has been discovered in GitLab EE affecting all versions from 16.4 prior to 16.6.7, 16.7 prior to 16.7.5, and 16.8 prior to 16.8.2 which allows a maintainer to change the name of a protected branch that bypasses the security policy added to block MR.\"}, {\"lang\": \"es\", \"value\": \"Se ha descubierto un problema en GitLab EE que afecta a todas las versiones desde 16.4 anterior a 16.6.7, 16.7 anterior a 16.7.5 y 16.8 anterior a 16.8.2 lo que permite a un fabricante cambiar el nombre de una rama protegida que omite la pol\\u00edtica de seguridad agregada para bloquear MR.\"}]",
      "id": "CVE-2023-6840",
      "lastModified": "2024-11-21T08:44:39.447",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"cve@gitlab.com\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H\", \"baseScore\": 6.7, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"HIGH\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.2, \"impactScore\": 5.5}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H\", \"baseScore\": 6.7, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"HIGH\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.2, \"impactScore\": 5.5}]}",
      "published": "2024-02-07T22:15:09.500",
      "references": "[{\"url\": \"https://gitlab.com/gitlab-org/gitlab/-/issues/435500\", \"source\": \"cve@gitlab.com\", \"tags\": [\"Issue Tracking\", \"Permissions Required\"]}, {\"url\": \"https://hackerone.com/reports/2280292\", \"source\": \"cve@gitlab.com\", \"tags\": [\"Permissions Required\", \"Technical Description\"]}, {\"url\": \"https://gitlab.com/gitlab-org/gitlab/-/issues/435500\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Issue Tracking\", \"Permissions Required\"]}, {\"url\": \"https://hackerone.com/reports/2280292\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Permissions Required\", \"Technical Description\"]}]",
      "sourceIdentifier": "cve@gitlab.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"cve@gitlab.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-862\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"NVD-CWE-Other\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-6840\",\"sourceIdentifier\":\"cve@gitlab.com\",\"published\":\"2024-02-07T22:15:09.500\",\"lastModified\":\"2024-11-21T08:44:39.447\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"An issue has been discovered in GitLab EE affecting all versions from 16.4 prior to 16.6.7, 16.7 prior to 16.7.5, and 16.8 prior to 16.8.2 which allows a maintainer to change the name of a protected branch that bypasses the security policy added to block MR.\"},{\"lang\":\"es\",\"value\":\"Se ha descubierto un problema en GitLab EE que afecta a todas las versiones desde 16.4 anterior a 16.6.7, 16.7 anterior a 16.7.5 y 16.8 anterior a 16.8.2 lo que permite a un fabricante cambiar el nombre de una rama protegida que omite la pol\u00edtica de seguridad agregada para bloquear MR.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cve@gitlab.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H\",\"baseScore\":6.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.2,\"impactScore\":5.5},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H\",\"baseScore\":6.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.2,\"impactScore\":5.5}]},\"weaknesses\":[{\"source\":\"cve@gitlab.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-862\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*\",\"versionStartIncluding\":\"16.4.0\",\"versionEndExcluding\":\"16.6.7\",\"matchCriteriaId\":\"5A1A9E0E-DFC2-4567-9218-6F7B9FE56F34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*\",\"versionStartIncluding\":\"16.7.0\",\"versionEndExcluding\":\"16.7.5\",\"matchCriteriaId\":\"8ECA9350-B77B-41F6-B234-72BF47FD50E7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*\",\"versionStartIncluding\":\"16.8.0\",\"versionEndExcluding\":\"16.8.2\",\"matchCriteriaId\":\"FDA190F8-0AAA-44DF-8A6B-A9A4380D478C\"}]}]}],\"references\":[{\"url\":\"https://gitlab.com/gitlab-org/gitlab/-/issues/435500\",\"source\":\"cve@gitlab.com\",\"tags\":[\"Issue Tracking\",\"Permissions Required\"]},{\"url\":\"https://hackerone.com/reports/2280292\",\"source\":\"cve@gitlab.com\",\"tags\":[\"Permissions Required\",\"Technical Description\"]},{\"url\":\"https://gitlab.com/gitlab-org/gitlab/-/issues/435500\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Permissions Required\"]},{\"url\":\"https://hackerone.com/reports/2280292\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Permissions Required\",\"Technical Description\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://gitlab.com/gitlab-org/gitlab/-/issues/435500\", \"name\": \"GitLab Issue #435500\", \"tags\": [\"issue-tracking\", \"x_transferred\"]}, {\"url\": \"https://hackerone.com/reports/2280292\", \"name\": \"HackerOne Bug Bounty Report #2280292\", \"tags\": [\"technical-description\", \"exploit\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T08:42:08.148Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-6840\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-12-18T17:54:46.828519Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-07-05T15:20:36.712Z\"}}], \"cna\": {\"title\": \"Missing Authorization in GitLab\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Thanks [js_noob](https://hackerone.com/js_noob) for reporting this vulnerability through our HackerOne bug bounty program\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"HIGH\", \"confidentialityImpact\": \"LOW\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*\"], \"repo\": \"git://git@gitlab.com:gitlab-org/gitlab.git\", \"vendor\": \"GitLab\", \"product\": \"GitLab\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.4\", \"lessThan\": \"16.6.7\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"16.7\", \"lessThan\": \"16.7.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"16.8\", \"lessThan\": \"16.8.2\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade to versions 16.8.2, 16.7.5, 16.6.7 or above.\"}], \"references\": [{\"url\": \"https://gitlab.com/gitlab-org/gitlab/-/issues/435500\", \"name\": \"GitLab Issue #435500\", \"tags\": [\"issue-tracking\"]}, {\"url\": \"https://hackerone.com/reports/2280292\", \"name\": \"HackerOne Bug Bounty Report #2280292\", \"tags\": [\"technical-description\", \"exploit\", \"permissions-required\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"An issue has been discovered in GitLab EE affecting all versions from 16.4 prior to 16.6.7, 16.7 prior to 16.7.5, and 16.8 prior to 16.8.2 which allows a maintainer to change the name of a protected branch that bypasses the security policy added to block MR.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-862\", \"description\": \"CWE-862: Missing Authorization\"}]}], \"providerMetadata\": {\"orgId\": \"ceab7361-8a18-47b1-92ba-4d7d25f6715a\", \"shortName\": \"GitLab\", \"dateUpdated\": \"2025-11-20T04:11:43.314Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-6840\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-20T04:11:43.314Z\", \"dateReserved\": \"2023-12-15T12:02:46.848Z\", \"assignerOrgId\": \"ceab7361-8a18-47b1-92ba-4d7d25f6715a\", \"datePublished\": \"2024-02-07T22:02:20.934Z\", \"assignerShortName\": \"GitLab\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.