CVE-2023-37898

Joplin is a free, open source note taking and to-do application. A Cross-site Scripting (XSS) vulnerability allows an untrusted note opened in safe mode to execute arbitrary code. `packages/renderer/MarkupToHtml.ts` renders note content in safe mode by surrounding it with <pre> and </pre>, without escaping any interior HTML tags. Thus, an attacker can create a note that closes the opening <pre> tag, then includes HTML that runs JavaScript. Because the rendered markdown iframe has the same origin as the toplevel document and is not sandboxed, any scripts running in the preview iframe can access the top variable and, thus, access the toplevel NodeJS `require` function. `require` can then be used to import modules like fs or child_process and run arbitrary commands. This issue has been addressed in version 2.12.9 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

• CWE-79
• CWE-79

• https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe#sandboxTechnical Description
• https://github.com/laurent22/joplin/security/advisories/GHSA-hjmq-3qh4-g2r8Exploit, Vendor Advisory
• https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe#sandboxTechnical Description
• https://github.com/laurent22/joplin/security/advisories/GHSA-hjmq-3qh4-g2r8Exploit, Vendor Advisory

Published

Jun 21, 2024

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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