Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2026-03-27 12:15

Modified

2026-03-27 12:16

Summary

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

Details

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.7 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 execute arbitrary JavaScript in a user's browser due to improper sanitization of entity-encoded content in Mermaid diagrams.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "gitlab",
        "purl": "pkg:bitnami/gitlab"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "17.7.0"
            },
            {
              "fixed": "18.8.7"
            },
            {
              "introduced": "18.9.0"
            },
            {
              "fixed": "18.9.3"
            },
            {
              "introduced": "18.10.0"
            },
            {
              "fixed": "18.10.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-2973"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*",
      "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.7 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 execute arbitrary JavaScript in a user\u0027s browser due to improper sanitization of entity-encoded content in Mermaid diagrams.",
  "id": "BIT-gitlab-2026-2973",
  "modified": "2026-03-27T12:16:52.978Z",
  "published": "2026-03-27T12:15:10.065Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/591049"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3566802"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2973"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) in GitLab"
}

CVE-2026-2973 (GCVE-0-2026-2973)

Vulnerability from cvelistv5 – Published: 2026-03-25 16:34 – Updated: 2026-03-26 17:24

Title

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

Summary

Severity ?

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitLab

References

URL

Tags

	https://hackerone.com/reports/3566802	technical-descriptionexploitpermissions-required
	https://gitlab.com/gitlab-org/gitlab/-/work_items…
	https://about.gitlab.com/releases/2026/03/25/patc…

Impacted products

	Vendor	Product	Version
	GitLab	GitLab	Affected: 17.7 , < 18.8.7 (semver) Affected: 18.9 , < 18.9.3 (semver) Affected: 18.10 , < 18.10.1 (semver) cpe:2.3:a:gitlab:gitlab::::::::

Credits

Thanks [go7f0](https://hackerone.com/go7f0) for reporting this vulnerability through our HackerOne bug bounty program

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-2973",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-26T17:24:23.575803Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-26T17:24:32.440Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "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": "18.8.7",
              "status": "affected",
              "version": "17.7",
              "versionType": "semver"
            },
            {
              "lessThan": "18.9.3",
              "status": "affected",
              "version": "18.9",
              "versionType": "semver"
            },
            {
              "lessThan": "18.10.1",
              "status": "affected",
              "version": "18.10",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Thanks [go7f0](https://hackerone.com/go7f0) 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 17.7 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 execute arbitrary JavaScript in a user\u0027s browser due to improper sanitization of entity-encoded content in Mermaid diagrams."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T16:34:03.852Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "name": "HackerOne Bug Bounty Report #3566802",
          "tags": [
            "technical-description",
            "exploit",
            "permissions-required"
          ],
          "url": "https://hackerone.com/reports/3566802"
        },
        {
          "url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/591049"
        },
        {
          "url": "https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to versions 18.8.7, 18.9.3, 18.10.1 or above."
        }
      ],
      "title": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) in GitLab"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2026-2973",
    "datePublished": "2026-03-25T16:34:03.852Z",
    "dateReserved": "2026-02-22T11:04:12.829Z",
    "dateUpdated": "2026-03-26T17:24:32.440Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2026-2973 (GCVE-0-2026-2973)

Tags

Sightings

Nomenclature