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CVE-2026-5816 is an improper resolution of path equivalence vulnerability in GitLab CE/EE's Web IDE asset serving component. Affected versions fail to correctly normalize and validate certain URL paths before serving Web IDE assets, allowing path equivalence tricks to bypass intended path-based restrictions under specific conditions. By supplying a specially crafted request, an unauthenticated attacker can cause attacker-controlled JavaScript to be delivered and executed in the browser context of an authenticated GitLab user. The issue affects GitLab CE/EE 18.10.x before 18.10.4 and 18.11.x before 18.11.1.
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An improper path validation vulnerability in GitLab CE/EE that could allow an unauthenticated user to execute arbitrary JavaScript in a user's browser session under certain conditions.
A path equivalence flaw in GitLab Web IDE asset serving that leads to unauthenticated cross-site scripting (XSS) in authenticated users' browser sessions, enabling session hijacking and potentially administrative takeover or unauthorized code commits.
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.
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Cross-references every affected SKU, including bundled OEM variants.
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