CVE-2026-87719Network attack vectorHinoki check available

Credential disclosure via GraphQL object lookup

Published Sep 12, 2026 · Updated Sep 12, 2026

Insecure deserialization in affected GitLab EE releases allows remote authenticated users to obtain Advanced Search credentials. The GraphQL subscription serializer accepts a specially crafted subscription argument that bypasses serialization controls and performs server-side object lookup. Exploitation requires an authenticated account with Duo Chat access and exposes Advanced Search instance configuration and sensitive credentials.

CVSS severity9.9
Critical
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Insecure deserialization in affected GitLab EE releases allows remote authenticated users to obtain Advanced Search credentials. The GraphQL subscription serializer accepts a specially crafted subscription argument that bypasses serialization controls and performs server-side object lookup. Exploitation requires an authenticated account with Duo Chat access and exposes Advanced Search instance configuration and sensitive credentials.

The record

CVE
CVE-2026-87719
Published
Sep 12, 2026
Updated
Sep 12, 2026
Vendor
GitLab
Product
GitLab
Classifications
T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 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=18.3 <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=18.3 <19.1.8; version=19.2 <19.2.6; version=19.3 <19.3.2

Published CVSS scores

9.9GitLabCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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

T1552Unsecured Credentials

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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