CVE-2022-40276: Zettlr

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Zettlr version 2.3.0 allows an external attacker to remotely obtain arbitrary local files on any client that attempts to view a malicious markdown file through Zettlr. This is possible because the application does not have a CSP policy (or at least not strict enough) and/or does not properly validate the contents of markdown files before rendering them.

Affected products

• Zettlr Zettlr: version 2.3.0 only

Published 2022-11-03. Last modified 2026-06-17.