CVE-2021-39906 in the critical feed json
Improper validation of ipynb files in GitLab CE/EE version 13.5 and above allows an attacker to execute arbitrary JavaScript code on the vi…
published 2021-11-04 5 y ago modified 2026-09-10 1 mo ago also BIT-gitlab-2021-39906 , EUVD-2021-26262
- cvss
- 8.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 60.7%
- EPSS 60.7% chance of exploitation in 30 days, percentile 99.1%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami gitlab 14.2.6, 14.3.4, 14.4.1
- gitlab gitlab 14.2.6, 14.3.4, 14.4.1
- gitlab gitlab_enterprise 14.2.6, 14.3.4, 14.4.1
- gitlab Arch Linux 14.5.0-1
arch linux advisories AVG-2503
Exploit prediction
60.73% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| OSV | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | gitlab | >=13.5.0, <14.2.6 >=14.3.0, <14.3.4 >=14.4.0, <14.4.1 |
14.2.6 14.3.4 14.4.1 |
Affected products
- GitLab GitLab
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
-
gitlab.com
/gitlab-org/cves/-/blob/master/2021/CVE-2021-39906.json
vendor-advisory, advisory
-
gitlab.com
/gitlab-org/gitlab/-/issues/341566
broken-link, web
-
hackerone.com
/reports/1347600
permissions-required, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-39906
web
Sources
- CVE List CVE-2021-39906
- NVD CVE-2021-39906
- OSV BIT-gitlab-2021-39906
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Enhance with deb and rpm package type records.