EUVD-2026-76778
GHSA-prp4-5w2g-8v2c
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Authenticated Duo Chat user (PR:L) over network leaks other-system credentials/config (S:C, C:H); integrity impact only indirect via reused creds (I:L) and no direct availability impact (A:N).
Primary rating from Vendor (GitLab).
CVSS VectorVendor: GitLab
Lifecycle Timeline
3DescriptionCVE.org
GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.
Articles & Coverage 1
AnalysisAI
Sensitive credential and configuration disclosure in GitLab Enterprise Edition allows an authenticated user with Duo Chat access to exfiltrate Advanced Search (Elasticsearch) instance configurations and stored credentials by supplying a specially crafted GraphQL subscription argument that bypasses serialization and forces an internal server object lookup. It affects EE 18.3 through 19.1.8, 19.2 through 19.2.6, and 19.3 through 19.3.2, was reported by GitLab, and publicly available exploit code exists (HackerOne #4012289). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated GitLab EE account (PR:L) that specifically has GitLab Duo Chat access enabled - Duo Chat is a licensed AI add-on, so instances without it provisioned are not exploitable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS is 9.9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H): network vector, low complexity, low privileges, no user interaction, and scope change. … 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 | Vendor-released patch: upgrade to GitLab EE 19.1.8, 19.2.6, or 19.3.2 (or later) depending on your release branch - these are the fixed versions per the GitLab advisory at https://gitlab.com/gitlab-org/gitlab/-/work_items/628160. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all GitLab EE instances in affected versions (18.3-19.1.8, 19.2-19.2.6, 19.3-19.3.2), audit Duo Chat access logs for suspicious GraphQL subscription activity, and isolate Elasticsearch instances from direct network access. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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