CVE-2023-48219

Special characters in unescaped text nodes can trigger mXSS in TinyMCE

Description

TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo/redo functionality and other APIs and plugins. Text nodes within specific parents are not escaped upon serialization according to the HTML standard. If such text nodes contain a special character reserved as an internal marker, they can be combined with other HTML patterns to form malicious snippets. These snippets pass the initial sanitisation layer when the content is parsed into the editor body, but can trigger XSS when the special internal marker is removed from the content and re-parsed. his vulnerability has been patched in TinyMCE versions 6.7.3 and 5.10.9. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 2.02% Top 20%
Vendor Advisory github.com
Affected: tinymce tinymce
Published at:
Updated at:

References

Link Tags
https://github.com/tinymce/tinymce/security/advisories/GHSA-v626-r774-j7f8 vendor advisory
https://tiny.cloud/docs/release-notes/release-notes5109/ release notes
https://tiny.cloud/docs/tinymce/6/6.7.3-release-notes/ release notes

Frequently Asked Questions

What is the severity of CVE-2023-48219?
CVE-2023-48219 has been scored as a medium severity vulnerability.
How to fix CVE-2023-48219?
To fix CVE-2023-48219, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-48219 being actively exploited in the wild?
It is possible that CVE-2023-48219 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-48219?
CVE-2023-48219 affects tinymce tinymce.
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