Bug 2486194 (CVE-2026-11569)

Summary: CVE-2026-11569 quay: quay: Stored XSS via Filedrop SVG Upload
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bdettelb, doconnor
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Quay. The filedrop endpoint accepts any mime type without validation, allowing an authenticated user with repository write access to upload a malicious SVG file containing JavaScript. The file is stored and served inline through the CDN, enabling stored cross-site scripting when a victim visits the archive URL.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-06-08 09:17:56 UTC 
The filedrop endpoint (POST /api/v1/filedrop/) accepts any mimeType without validation, including image/svg+xml, text/html, and application/javascript. An attacker with repository write access can upload a malicious SVG file containing JavaScript, create a build referencing the file_id, and obtain an archive_url that serves the SVG through the CDN. When a victim visits the archive URL, the browser renders the SVG inline and executes the embedded JavaScript. The malicious SVG is stored in the object storage backend and served through a legitimate Quay domain. However, session hijacking is not possible as the _csrf_token session cookie is configured with HttpOnly and Secure attributes.