CVE-2026-3855Network attack vectorHinoki check available

Restricted file disclosure via malformed upload parameters

Published Sep 16, 2026 · Updated Sep 16, 2026

Improper input validation in affected GitLab CE/EE releases allows remote authenticated users to read restricted server files. The Terraform state upload path accepts crafted parameters without adequate validation, but GitLab has not disclosed the exact parameter or unsafe operation. Project-level permissions are required, and GitLab also reports denial of service under otherwise unspecified conditions.

CVSS severity3.1
Low
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper input validation in affected GitLab CE/EE releases allows remote authenticated users to read restricted server files. The Terraform state upload path accepts crafted parameters without adequate validation, but GitLab has not disclosed the exact parameter or unsafe operation. Project-level permissions are required, and GitLab also reports denial of service under otherwise unspecified conditions.

The record

CVE
CVE-2026-3855
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
GitLab
Product
GitLab
Classifications
CWE-20
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=18.2.7 <19.1.8
  2. Affected versionversion=19.2 <19.2.6
  3. Affected versionversion=19.3 <19.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=18.2.7 <19.1.8; version=19.2 <19.2.6; version=19.3 <19.3.2

Published CVSS scores

3.1GitLabCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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