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GitLab CVE-2026-3855

| EUVDEUVD-2026-80121 LOW
Improper Control of Resource Identifiers ('Resource Injection') (CWE-99)
2026-09-16 GitLab
3.1
CVSS 3.1 · Vendor: GitLab

Severity by source

Vendor (GitLab) PRIMARY
3.1 LOW
AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
vuln.today AI
4.2 MEDIUM

Authenticated project member required (PR:L) and precise parameter crafting needed (AC:H); low file-disclosure and possible availability impact.

3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L
4.0 AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

4
Metadata Corrected
Sep 16, 2026 - 07:40 vuln.today
tag: Terraform added
Analysis Generated
Sep 16, 2026 - 07:01 vuln.today
Patch available
Sep 16, 2026 - 07:01 EUVD
CVE Published
Sep 16, 2026 - 06:34 cve.org
LOW 3.1

DescriptionCVE.org

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.

AnalysisAI

Improper validation of parameters in GitLab CE/EE's Terraform state upload functionality allows an authenticated user holding project-level permissions to read restricted file contents on the server or cause denial of service. Affected releases are all versions from 18.2.7 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2, with fixes published in the 19.3.2 patch release. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated GitLab account holding project-level permissions sufficient to write to the Terraform state backend (GitLab's Developer role and above can push state to a project's state endpoint; CVSS PR:L confirms authenticated, non-admin access). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals conflict and should be read carefully. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to a fixed release: GitLab 19.1.8, 19.2.6, or 19.3.2 (the earliest fix on each affected branch). … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-3855 vulnerability details – vuln.today

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