{"cve":"CVE-2021-39906","nvd":{"published":"2021-11-05T00:15:10.977","modified":"2026-06-17T04:04:24.110","status":"Modified","description":"Improper validation of ipynb files in GitLab CE/EE version 13.5 and above allows an attacker to execute arbitrary JavaScript code on the victim's behalf.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39906.json","https://gitlab.com/gitlab-org/gitlab/-/issues/341566","https://hackerone.com/reports/1347600","https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39906.json","https://gitlab.com/gitlab-org/gitlab/-/issues/341566"],"products":["gitlab:gitlab"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2021-39906","score":0.60729,"percentile":0.99148,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}