{"id":"CVE-2026-6335","aliases":["BIT-gitlab-2026-6335","EUVD-2026-30235","GHSA-3jrg-257v-4fw6","UBUNTU-CVE-2026-6335"],"status":"published","title":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00192,"percentile":0.09006,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-05-14T05:33:57Z","modified":"2026-10-30T10:31:01Z","fixes":[{"ecosystem":"Bitnami","package":"gitlab","fixed_in":["18.11.3"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"gitlab","ranges":[{"type":"SEMVER","events":[{"introduced":"18.11.0"},{"fixed":"18.11.3"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"gitlab","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.4.3+dfsg-9","8.4.3+dfsg-12","8.5.8+dfsg-5"]}],"products":[{"vendor":"gitlab","product":"gitlab"}],"references":[{"url":"https://gitlab.com/gitlab-org/gitlab/-/work_items/596760","tags":["Broken Link","web","report"]},{"url":"https://hackerone.com/reports/3673647","tags":["technical-description","exploit","permissions-required","Permissions Required","web","report"]},{"url":"https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/","tags":["Release Notes","article","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6335","tags":["web","advisory"]},{"url":"https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released"},{"url":"https://github.com/advisories/GHSA-3jrg-257v-4fw6"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6335.json","tags":["advisory"]},{"url":"git://git@gitlab.com:gitlab-org/gitlab.git","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-6335","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-6335","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-6335","title":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization.","status":"published","published":"2026-05-14T05:33:57.334Z","modified":"2026-05-15T09:58:59.492Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:50:04.986624Z"}],"euvd":[{"id":"EUVD-2026-30235","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization.","status":"published","published":"2026-05-14T05:33:57Z","modified":"2026-05-15T09:58:59Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:04:30.03108Z"}],"ghsa":[{"id":"GHSA-3jrg-257v-4fw6","title":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3...","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization.","status":"published","published":"2026-05-14T06:31:34Z","modified":"2026-05-14T06:31:40Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:08:08.28199Z"}],"nvd":[{"id":"CVE-2026-6335","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization.","status":"published","published":"2026-05-14T06:16:24.78Z","modified":"2026-06-17T11:00:40.883Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:19.020465Z"}],"osv":[{"id":"CVE-2026-6335","title":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper 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GitLab","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization.","status":"published","published":"2026-05-18T06:11:18.666Z","modified":"2026-09-08T08:47:46.511528218Z","updated_at":"2026-11-02T15:28:30.70064Z"}]}}