Cross-site scripting in GitLab CE/EE Storybook development environment
CVE-2026-5262 is a cross-site scripting vulnerability in GitLab CE/EE's Storybook development environment caused by improper input validation and insufficient sanitization of user-supplied input before rendering. It affects GitLab CE/EE versions 16.1.0 through 18.9.x before 18.9.6, 18.10.x before 18.10.4, and 18.11.x before 18.11.1. Under certain conditions, an unauthenticated attacker can cause malicious script to execute in a victim's browser within the Storybook context, allowing access to tokens present in that development environment.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper input validation vulnerability in GitLab CE/EE that could allow an unauthenticated user to access tokens in the Storybook development environment under certain conditions.
A high-severity cross-site scripting vulnerability in GitLab's Storybook development environment that can expose sensitive tokens to unauthenticated attackers, potentially enabling authenticated access to broader GitLab resources.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.