CVE-2024-40643 Joplin has a parsing error leading to Cross-site Scripting (XSS)
An attacker can execute arbitrary scripts in Joplin by exploiting a parsing error that mishandles illegal tags within HTML content.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2024-40643?
CVE-2024-40643 is a critical cross-site scripting vulnerability in laurent22 joplin, published on 9 Sep 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Joplin is a free, open source note taking and to-do application. Joplin fails to take into account that "<" followed by a non letter character will not be considered html. As such it is possible to do an XSS by putting an "illegal" tag within a tag.
Weakness: CWE-79
Which versions are affected by CVE-2024-40643?
It affects 1 product.
Products include Joplin Project Joplin.
How do I fix CVE-2024-40643?
No fix has been published for CVE-2024-40643 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2024-40643 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-40643 exists.
Other vulnerabilities in laurent22 joplin
- CVE-2022-23340 Joplin Vulnerable to Code Injection
- CVE-2023-45673 Arbitrary code execution on click of PDF links in Joplin
- CVE-2025-27134 Privilege escalation in Joplin server via user patch endpoint
- CVE-2023-37898 Safe mode Cross-site Scripting (XSS) vulnerability in Joplin
- CVE-2023-38506 Cross-site Scripting (XSS) when pasting HTML into the rich text editor in Joplin
Sources
Also known as GHSA-g796-3g6g-jmmc.