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CVE-2026-25731 PoC — Calibre Affected by Arbitrary Code Execution via Server-Side Template Injection in Calibre HTML Export

Source
https://github.com/dxlerYT/CVE-2026-25731
Associated Vulnerability
Title:Calibre Affected by Arbitrary Code Execution via Server-Side Template Injection in Calibre HTML Export (CVE-2026-25731)
Description:calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows arbitrary code execution when a user converts an ebook using a malicious custom template file via the --template-html or --template-html-index command-line options. This vulnerability is fixed in 9.2.0.
Description
Proof of Concept for a Server-Side Template Injection (SSTI) vulnerability in Calibre’s Templite engine (GHSA-xrh9-w7qx-3gcc). Demonstrates arbitrary Python code execution via user-supplied HTML export templates in affected versions (≤ 9.1.0).
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