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CVE-2026-5262

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

MEDIUM
6.1
CVSS Score
Published: April 22, 2026 at 04:04 PM UTC
Updated: June 17, 2026 at 10:58 AM UTC
1 product affected across 1 vendorGitLab

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.1.0 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an unauthenticated user to access tokens in the Storybook development environment due to improper input validation.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GitLab· GitLabmaven
95%
16.1.0 ≤ v < 18.9.618.10 ≤ v < 18.10.418.10.0 ≤ v < 18.10.418.11 ≤ v < 18.11.116.1.018.1018.1118.11.0
Affected range stops below 18.10.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 18.11.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 18.9.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Broken Link
Source: cverecord
https://gitlab.com/gitlab-org/gitlab/-/work_items/595332
Technical DescriptionExploitPermissions Required
Source: cverecord
https://hackerone.com/reports/3574642
Release NotesVendor Advisory
Source: cverecord
https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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