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CVE-2026-3093— 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 CE/EE是美国GitLab公司的一款信息化产品。 GitLab CE/EE 14.0版本至19.0.5之前版本、19.1版本至19.1.3之前版本和19.2版本至19.2.1之前版本存在跨站脚本漏洞，该漏洞源于用户控制输入清理不当，可能导致攻击者通过特制URL在另一个用户的浏览器中执行任意JavaScript。

CVSS 4.7 · Medium EPSS 0.29% · P19

Affected Version Matrix 3

VendorProduct Version RangeStatus
GitLab GitLab 14.0< 19.0.5 affected
19.1< 19.1.3 affected
19.2< 19.2.1 affected
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I. Basic Information for CVE-2026-3093

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 CE/EE affecting all versions from 14.0 before 19.0.5, 19.1 before 19.1.3, and 19.2 before 19.2.1 that under certain conditions could have allowed an attacker to execute arbitrary JavaScript in another user's browser via a crafted URL, due to improper sanitization of user-controlled input.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/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 CE/EE 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab CE/EE是美国GitLab公司的一款信息化产品。 GitLab CE/EE 14.0版本至19.0.5之前版本、19.1版本至19.1.3之前版本和19.2版本至19.2.1之前版本存在跨站脚本漏洞，该漏洞源于用户控制输入清理不当，可能导致攻击者通过特制URL在另一个用户的浏览器中执行任意JavaScript。
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 14.0 ~ 19.0.5 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-3093

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III. Intelligence Information for CVE-2026-3093

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Patches & Fixes for CVE-2026-3093 (1)

Other References for CVE-2026-3093 (1)

Same Patch Batch · GitLab · 2026-07-29 · 13 CVEs total

CVE-2026-6267 8.5 HIGH Insertion of Sensitive Information Into Sent Data in GitLab
CVE-2026-12436 8.4 HIGH Improperly Controlled Modification of Dynamically-Determined Object Attributes in GitLab
CVE-2026-15975 7.5 HIGH Allocation of Resources Without Limits or Throttling in GitLab
CVE-2026-13113 6.5 MEDIUM Time-of-check Time-of-use (TOCTOU) Race Condition in GitLab
CVE-2026-16553 5.4 MEDIUM Insufficiently Protected Credentials in GitLab
CVE-2026-6336 5.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-14341 4.9 MEDIUM Missing Authorization in GitLab
CVE-2026-15831 4.3 MEDIUM Generation of Incorrect Security Tokens in GitLab
CVE-2026-15077 4.3 MEDIUM Improper Neutralization of Input Used for LLM Prompting in GitLab
CVE-2026-14351 4.3 MEDIUM Exposure of Sensitive Information Through Metadata in GitLab
CVE-2026-4672 4.3 MEDIUM Missing Authorization in GitLab
CVE-2025-14562 3.1 LOW Incorrect Authorization in GitLab

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-3093

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