Bug 2542699 (CVE-2026-102295)

Summary: CVE-2026-102295 quay: quay: DOM-based cross-site scripting via OAuth local callback format=json parameter
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: doconnor
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Quay. A cross-site scripting (XSS) vulnerability in the OAuth callback handler allows a remote attacker to execute arbitrary JavaScript code within a user's browser session. By tricking a logged-in user into visiting a specially crafted link, an attacker can exploit improper input sanitization to run client-side scripts in the application context. Successful exploitation could allow the attacker to compromise the user's session, access sensitive registry information, or perform unauthorized actions on their behalf.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-28 20:58:20 UTC 
A DOM-based cross-site scripting (XSS) flaw was found in Project Quay's OAuth local callback handler (OAuthLocalHandler.tsx). When the format=json query parameter is supplied, the component reads the access_token from the URL fragment and assigns it to document.body.innerHTML via JSON.stringify, which does not HTML-encode angle brackets. An attacker can craft a URL containing a malicious access_token in the fragment that, when clicked by a Quay user, executes arbitrary JavaScript in the Quay registry origin. The format=json code path bypasses OAuth state validation and requires no authentication.