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8.2

Cross-site Scripting (XSS) when pasting HTML into the rich text editor in Joplin

CVE-2023-38506 · published 2 years ago
Summary

Joplin is a free, open source note taking and to-do application. A Cross-site Scripting (XSS) vulnerability allows pasting untrusted data into the rich text editor to execute arbitrary code. HTML pasted into the rich text editor is not sanitized (or not sanitized properly). As such, the `onload` att...

What to do
  • Update joplin_project joplin to version 2.12.10 or later.
Affected software
VendorProductAffected versions
joplin_project joplin < 2.12.10
cpe:2.3:a:joplin_project:joplin:*:*:*:*:*:-:*:*
Original advisory text
Cross-site Scripting (XSS) when pasting HTML into the rich text editor in Joplin
Joplin is a free, open source note taking and to-do application. A Cross-site Scripting (XSS) vulnerability allows pasting untrusted data into the rich text editor to execute arbitrary code. HTML pasted into the rich text editor is not sanitized (or not sanitized properly). As such, the `onload` attribute of pasted images can execute arbitrary code. Because the TinyMCE editor frame does not use the `sandbox` attribute, such scripts can access NodeJS's `require` through the `top` variable. From this, an attacker can run arbitrary commands. This issue has been addressed in version 2.12.10 and users are advised to upgrade. There are no known workarounds for this vulnerability.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
8.2 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published21 Jun 2024
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2023-38506 · NVD
CVE-2023-38506 · OSV
GHSA-m59c-9rrj-c399 · GHSA
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