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CVE-2026-84739

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

CVSS 3.1 8.7 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-84739

Published

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary JavaScript in the context of another user's browser session due to improper sanitization of path components in the merge request diff viewer.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-84739

Published

GitLab

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "GitLab",
                    "product": "GitLab",
                    "repo": "https://gitlab.com/gitlab-org/gitlab",
                    "cpes": [
                        "cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"
                    ],
                    "versions": [
                        {
                            "version": "13.11",
                            "status": "affected",
                            "lessThan": "19.2.7",
                            "versionType": "semver"
                        },
                        {
                            "version": "19.3",
                            "status": "affected",
                            "lessThan": "19.3.3",
                            "versionType": "semver"
                        },
                        {
                            "version": "19.4",
                            "status": "affected",
                            "lessThan": "19.4.1",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON