CVE-2023-39517: Cross site scripting (XSS) when clicking on an untrusted `<map>` link in Joplin
Joplin is a free, open source note taking and to-do application. A Cross site scripting (XSS) vulnerability in affected versions allows clicking on an untrusted image link to execute arbitrary shell commands. The HTML sanitizer (packages/renderer/htmlUtils.ts::sanitizeHtml) preserves <map> <area> links. However, unlike <a> links, the target and href attributes are not removed. Additionally, because the note preview pane isn't sandboxed to prevent top navigation, links with target set to top can replace the toplevel electron page. Because any toplevel electron page, with Joplin's setup, has access to require and can require node libraries, a malicious replacement toplevel page can import childprocess and execute arbitrary shell commands. This issue has been fixed in commit 7c52c3e9a81a52ef1b42a951f9deb9d378d59b0f which is included in release version 2.12.8. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2023-39517?
CVE-2023-39517 is a high severity vulnerability due to its potential for executing arbitrary shell commands via cross-site scripting.
How do I fix CVE-2023-39517?
To fix CVE-2023-39517, upgrade to Joplin version 2.12.8 or later, which addresses this XSS vulnerability.
What versions of Joplin are affected by CVE-2023-39517?
CVE-2023-39517 affects all versions of Joplin prior to 2.12.8.
What type of security vulnerability is CVE-2023-39517?
CVE-2023-39517 is classified as a Cross Site Scripting (XSS) vulnerability.
Can CVE-2023-39517 be exploited through external links?
Yes, CVE-2023-39517 can be exploited by clicking on untrusted image links within the Joplin application.