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Vulnerability Details :

CVE-2026-3254

Summary
Assigner-GitLab
Assigner Org ID-ceab7361-8a18-47b1-92ba-4d7d25f6715a
Published At-22 Apr, 2026 | 16:29
Updated At-22 Apr, 2026 | 17:39
Rejected At-
Credits

Improper Restriction of Rendered UI Layers or Frames in GitLab

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitLab
Assigner Org ID:ceab7361-8a18-47b1-92ba-4d7d25f6715a
Published At:22 Apr, 2026 | 16:29
Updated At:22 Apr, 2026 | 17:39
Rejected At:
â–¼CVE Numbering Authority (CNA)
Improper Restriction of Rendered UI Layers or Frames in GitLab

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.

Affected Products
Vendor
GitLab Inc.GitLab
Product
GitLab
Repo
git://git@gitlab.com:gitlab-org/gitlab.git
CPEs
  • cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
Default Status
unaffected
Versions
Affected
  • From 18.11 before 18.11.1 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-1021CWE-1021: Improper Restriction of Rendered UI Layers or Frames
Type: CWE
CWE ID: CWE-1021
Description: CWE-1021: Improper Restriction of Rendered UI Layers or Frames
Metrics
VersionBase scoreBase severityVector
3.13.5LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Version: 3.1
Base score: 3.5
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Upgrade to version 18.11.1 or above.

Configurations

Workarounds

Exploits

Credits

finder
Thanks [joaxcar](https://hackerone.com/joaxcar) for reporting this vulnerability through our HackerOne bug bounty program
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://hackerone.com/reports/3572752
technical-description
exploit
permissions-required
https://gitlab.com/gitlab-org/gitlab/-/work_items/591587
N/A
Hyperlink: https://hackerone.com/reports/3572752
Resource:
technical-description
exploit
permissions-required
Hyperlink: https://gitlab.com/gitlab-org/gitlab/-/work_items/591587
Resource: N/A
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve@gitlab.com
Published At:22 Apr, 2026 | 17:16
Updated At:23 Apr, 2026 | 20:43

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.13.5LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 3.5
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
CPE Matches

GitLab Inc.
gitlab
>>gitlab>>18.11.0
cpe:2.3:a:gitlab:gitlab:18.11.0:*:*:*:community:*:*:*
GitLab Inc.
gitlab
>>gitlab>>18.11.0
cpe:2.3:a:gitlab:gitlab:18.11.0:*:*:*:enterprise:*:*:*
Weaknesses
CWE IDTypeSource
CWE-1021Primarycve@gitlab.com
CWE ID: CWE-1021
Type: Primary
Source: cve@gitlab.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://gitlab.com/gitlab-org/gitlab/-/work_items/591587cve@gitlab.com
Broken Link
https://hackerone.com/reports/3572752cve@gitlab.com
Permissions Required
Hyperlink: https://gitlab.com/gitlab-org/gitlab/-/work_items/591587
Source: cve@gitlab.com
Resource:
Broken Link
Hyperlink: https://hackerone.com/reports/3572752
Source: cve@gitlab.com
Resource:
Permissions Required

Change History

0
Information is not available yet

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Rejected-Not Available
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Action-Not Available
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CWE ID-CWE-1021
Improper Restriction of Rendered UI Layers or Frames
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Matching Score-6
Assigner-GitLab Inc.
ShareView Details
Matching Score-6
Assigner-GitLab Inc.
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EPSS-0.22% / 44.45%
||
7 Day CHG~0.00%
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Updated-07 Jan, 2025 | 17:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

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Action-Not Available
Vendor-GitLab Inc.
Product-gitlabGitLab
CWE ID-CWE-1021
Improper Restriction of Rendered UI Layers or Frames
CVE-2021-33596
Matching Score-4
Assigner-126858f1-1b65-4b74-81ca-7034f7f7723f
ShareView Details
Matching Score-4
Assigner-126858f1-1b65-4b74-81ca-7034f7f7723f
CVSS Score-3.5||LOW
EPSS-0.27% / 50.63%
||
7 Day CHG~0.00%
Published-05 Aug, 2021 | 19:26
Updated-03 Aug, 2024 | 23:50
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Fake Apple login prompt in F-Secure SAFE browser for iOS

Showing the legitimate URL in the address bar while loading the content from other domain. This makes the user believe that the content is served by a legit domain. Exploiting the vulnerability requires the user to click on a specially crafted, seemingly legitimate URL containing an embedded malicious redirect while using F-Secure Safe Browser for iOS.

Action-Not Available
Vendor-F-Secure Corporation
Product-safeF-Secure Mobile Security
CWE ID-CWE-1021
Improper Restriction of Rendered UI Layers or Frames
Details not found