CVE-2021-39935 (GCVE-0-2021-39935)

Vulnerability from cvelistv5 – Published: 2021-12-13 15:47 – Updated: 2026-02-03 17:20
VLAI? CISA KEV
Summary
An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. Unauthorized external users could perform Server Side Requests via the CI Lint API
Severity ?
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CWE
  • Server-side request forgery (ssrf) in GitLab
Assigner
References
Impacted products
Vendor Product Version
GitLab GitLab Affected: >=10.5, <14.3.6
Affected: >=14.4, <14.4.4
Affected: >=14.5, <14.5.2
Create a notification for this product.
Credits
Thanks @minhli for reporting this vulnerability through our HackerOne bug bounty program
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: be91d247-3c62-47b0-94fc-e0ddae52f44c

Vulnerability ID: CVE-2021-39935

Status: Confirmed

Status Updated: 2026-02-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-02-03
Asserted: 2026-02-03
Scope
Notes: KEV entry: GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability | Affected: GitLab / Community and Enterprise Editions | Description: GitLab Community and Enterprise Editions contain a server-side request forgery vulnerability which could allow unauthorized external users to perform Server Side Requests via the CI Lint API. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-02-24 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://about.gitlab.com/releases/2021/12/06/security-release-gitlab-14-5-2-released/ ; https://nvd.nist.gov/vuln/detail/CVE-2021-39935
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-918
Feed CISA Known Exploited Vulnerabilities Catalog
Product Community and Enterprise Editions
Due Date 2026-02-24
Date Added 2026-02-03
Vendorproject GitLab
Vulnerabilityname GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-04 08:04 UTC | Updated: 2026-02-06 07:17 UTC
Show details on NVD website
To clipboard 

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}


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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.