Cross-site scripting vulnerability in TinyMCE
Summary
GHSA-p7j5-4mwm-hv86: Duplicate Advisory: Cross-site scripting in TinyMCE. Affects tinymce across 2 version ranges.
< 4.9.7
>= 5.0.0, < 5.1.4
Fixed in 4.9.7 or 5.1.4, depending on the release line you run. How to fix ↓
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Background
TinyMCE is a popular open-source WYSIWYG editor used for creating rich text content in web applications. It provides a user-friendly interface for editing and formatting text. However, a cross-site scripting (XSS) vulnerability has been discovered in versions before 4.9.7 and 5.x before 5.1.4 of TinyMCE. This vulnerability allows an attacker to inject malicious code into the editor, potentially leading to unauthorized access, data theft, or other malicious activities.
Vulnerability Detail
The XSS vulnerability in TinyMCE is present in the core parser, the paste plugin, and the visualchars plugin. It can be exploited by using the clipboard or APIs to insert content into the editor. This allows an attacker to execute arbitrary JavaScript code in the context of the user's browser, leading to potential security breaches. The vulnerability has a CVSS score of 6.1, indicating a moderate severity level.
How To Fix
Latest published version: 8.10.0 as of 23 Oct 2026
npm install tinymce@8.10.0Upgrading to it may include breaking changes; the versions below are the minimum fixed release for this vulnerability.
If you can't move to the latest
The minimum fixed version depends on the release line you run.
-
< 4.9.74.9.7npm install tinymce@4.9.7 -
>= 5.0.0, < 5.1.45.1.4npm install tinymce@5.1.4
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
If updating TinyMCE is not immediately feasible, a temporary workaround is to disable the clipboard and paste plugins, as well as the visualchars plugin. This can be achieved by modifying the TinyMCE configuration to exclude these plugins. However, this workaround may limit certain functionality provided by these plugins.
Conclusion
The XSS vulnerability in TinyMCE poses a potential security risk to web applications using affected versions. It is crucial to update to the latest secure version of TinyMCE to mitigate this vulnerability. If immediate updating is not possible, disabling the affected plugins can serve as a temporary workaround. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows an attacker to execute malicious code in the user's browser, potentially leading to unauthorized access, data theft, or other malicious activities.
No, only versions before 4.9.7 and 5.x before 5.1.4 are affected. Updating to the latest secure version mitigates the vulnerability.
There are no known public exploits for this vulnerability at the moment. However, it is advisable to patch the vulnerability as soon as possible to prevent any potential exploitation.
Yes, this vulnerability can be exploited remotely by an attacker who can trick a user into visiting a specially crafted website or clicking on a malicious link.
Yes, the CVSS score for this vulnerability is 6.1, indicating a moderate severity level.
References
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