Calibre: two critical security vulnerabilities identified

Researchers have discovered two distinct vulnerabilities in Calibre, a digital library management software.

Published 9sem1 sourceNotableupdated 3sem

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The first flaw enables directory traversal through Markdown images, while the second allows Server-Side Request Forgery via the Background-image endpoint.

These vulnerabilities expose Calibre servers to unauthorized access and malicious requests from within the network.

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Auto-synthesis from 1 media source · identified on June 7, 2026

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