CVE-2026-87719— Deserialization of Untrusted Data in GitLab
Quick assessment
Affected
GitLab GitLab
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
GitLab 已修复 GitLab EE 中的一个安全漏洞。该问题影响以下版本：18.3 之前的所有版本、19.1 之前的 19.1.8 之前版本、19.2 之前的 19.2.6 之前版本，以及 19.3 之前的 19.3.2 之前版本。 在特定条件下，拥有 Duo Chat 访问权限的经过身份验证的用户，可以通过精心构造的 GraphQL 订阅参数，绕过序列化机制并执行服务器端对象查找，从而获取高级搜索（Advanced Search）实例配置及敏感凭证信息。
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I. Basic Information for CVE-2026-87719
Vulnerability Information
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Vulnerability Title
Deserialization of Untrusted Data in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-87719
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-87719 (2)
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V. Comments for CVE-2026-87719
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