Special characters in unescaped text nodes can trigger mXSS in TinyMCE
CVE-2023-48219

6.1MEDIUM

Key Information:

Vendor

Tinymce

Status
Tinymce
Vendor
CVE Published:
15 November 2023

What is CVE-2023-48219?

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.

Affected Version(s)

tinymce >= 6.0.0 < 6.7.3 < 6.0.0 6.7.3

tinymce < 5.10.9 < 5.10.9

References

https://github.com/tinymce/tinymce/security/advisories/GH...
x_refsource_CONFIRM
https://tiny.cloud/docs/release-notes/release-notes5109/
x_refsource_MISC
https://tiny.cloud/docs/tinymce/6/6.7.3-release-notes/
x_refsource_MISC

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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