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CVE-2026-8589— Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') 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 Enterprise Edition（EE）是美国GitLab公司的一套内容管理系统。 GitLab EE 13.1.4至18.10.8之前版本、18.11至18.11.5之前版本和19.0至19.0.2之前版本存在跨站脚本漏洞，该漏洞源于特定组设置字段中用户输入清理不当，可能导致已认证用户向目标用户账户添加未授权电子邮件地址。

CVSS 7.3 · High EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 3

VendorProduct Version RangeStatus
GitLab GitLab 13.1.4< 18.10.8 affected
18.11< 18.11.5 affected
19.0< 19.0.2 affected
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I. Basic Information for CVE-2026-8589

Vulnerability Information
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Vulnerability Title
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab has remediated an issue in GitLab EE affecting all versions from 13.1.4 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions could have allowed an authenticated user to add unauthorized email addresses to a targeted user's account due to improper sanitization of user-supplied input in certain group setting fields.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab Enterprise Edition（EE） 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab Enterprise Edition（EE）是美国GitLab公司的一套内容管理系统。 GitLab EE 13.1.4至18.10.8之前版本、18.11至18.11.5之前版本和19.0至19.0.2之前版本存在跨站脚本漏洞，该漏洞源于特定组设置字段中用户输入清理不当，可能导致已认证用户向目标用户账户添加未授权电子邮件地址。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitLab GitLab 13.1.4 ~ 18.10.8 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-8589

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III. Intelligence Information for CVE-2026-8589

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Other References for CVE-2026-8589 (1)

Same Patch Batch · GitLab · 2026-06-11 · 11 CVEs total

CVE-2026-10087 8.7 HIGH Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2026-7250 7.5 HIGH Allocation of Resources Without Limits or Throttling in GitLab
CVE-2026-1500 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2026-6269 5.4 MEDIUM Incorrect Authorization in GitLab
CVE-2026-9204 5.3 MEDIUM Server-Side Request Forgery (SSRF) in GitLab
CVE-2026-10733 4.3 MEDIUM Improper Restriction of Rendered UI Layers or Frames in GitLab
CVE-2026-6277 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-6976 3.7 LOW Authorization Bypass Through User-Controlled Key in GitLab
CVE-2026-3553 3.1 LOW Incorrect Authorization in GitLab
CVE-2026-9694 2.6 LOW Improper Neutralization of Substitution Characters in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-79

V. Comments for CVE-2026-8589

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