CVE-2026-3254— Improper Restriction of Rendered UI Layers or Frames in GitLab

CVSS 3.5 · Low EPSS 0.01% · P2 Updated Apr 23, 2026

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I. Basic Information for CVE-2026-3254

Vulnerability Information

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Vulnerability Title

Improper Restriction of Rendered UI Layers or Frames in GitLab

Source: NVD (National Vulnerability Database)

Vulnerability Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to load unauthorized content into another user's browser due to improper input validation in the Mermaid sandbox.

Source: NVD (National Vulnerability Database)

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Source: NVD (National Vulnerability Database)

Vulnerability Type

不当限制渲染UI层或帧

Source: NVD (National Vulnerability Database)

Vulnerability Title

GitLab CE/EE 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

GitLab Enterprise Edition（EE）和GitLab Community Edition（CE）都是美国GitLab公司的产品。GitLab Enterprise Edition是一套内容管理系统。GitLab Community Edition是一种社区版 GitLab 。 GitLab CE/EE 18.11.1之前版本存在安全漏洞，该漏洞源于Mermaid沙箱输入验证不当，可能导致认证用户将未经授权的内容加载到其他用户浏览器。

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	18.11 ~ 18.11.1	`cpe:2.3:a:gitlab:gitlab::::::::`

II. Public POCs for CVE-2026-3254

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III. Intelligence Information for CVE-2026-3254

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https://nvd.nist.gov/vuln/detail/CVE-2026-3254

Same Patch Batch · GitLab · 2026-04-22 · 11 CVEs total

CVE-2026-4922	8.1 HIGH	Cross-Site Request Forgery (CSRF) in GitLab
CVE-2026-5262	8.0 HIGH	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2026-5816	8.0 HIGH	Improper Resolution of Path Equivalence in GitLab
CVE-2025-0186	6.5 MEDIUM	Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-3922	6.5 MEDIUM	Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-6016	6.5 MEDIUM	Allocation of Resources Without Limits or Throttling in GitLab
CVE-2026-1660	6.5 MEDIUM	Allocation of Resources Without Limits or Throttling in GitLab
CVE-2026-6515	5.4 MEDIUM	Insufficient Session Expiration in GitLab
CVE-2026-5377	4.3 MEDIUM	Incorrect Authorization in GitLab
CVE-2025-9957	2.7 LOW	Incorrect Authorization in GitLab

IV. Related Vulnerabilities

Same product: GitLab

Same vendor: GitLab

Same weakness: CWE-1021

V. Comments for CVE-2026-3254

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CVE-2026-3254— Improper Restriction of Rendered UI Layers or Frames in GitLab

I. Basic Information for CVE-2026-3254

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-3254

III. Intelligence Information for CVE-2026-3254

Same Patch Batch · GitLab · 2026-04-22 · 11 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-3254

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