GitLab CE/EE 18.x-19.3: Authenticated FS Disclosure via Terraform State Upload (CVE-2026-3855)
CVE-2026-3855 Published on September 16, 2026
Improper Control of Resource Identifiers ('Resource Injection') in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2.7 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could have allowed an authenticated user with project-level permissions to access restricted file contents on the server or cause denial of service due to improper validation of parameters in the Terraform state upload functionality.
Vulnerability Analysis
CVE-2026-3855 can be exploited with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an Insecure Direct Object Reference Vulnerability?
The software receives input from an upstream component, but it does not restrict or incorrectly restricts the input before it is used as an identifier for a resource that may be outside the intended sphere of control.
CVE-2026-3855 has been classified to as an Insecure Direct Object Reference vulnerability or weakness.
Products Associated with CVE-2026-3855
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Affected Versions
GitLab:- Version 18.2.7 and below 19.1.8 is affected.
- Version 19.2 and below 19.2.6 is affected.
- Version 19.3 and below 19.3.2 is affected.