CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
20.6%
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. Such mutations occur when serialised HTML content is processed before being stored in the undo stack, or when the following APIs and plugins are used:
This vulnerability has been patched in TinyMCE 6.7.3 by:
Editor.setContent
, Editor.insertContent
, and Editor.resetContent
APIs to prevent them from being loaded into the editor as user-provided content.To avoid this vulnerability:
Tiny Technologies would like to thank Masato Kinugawa of Cure53 for discovering this vulnerability.
Email us at [email protected]
Open an issue in the TinyMCE repo
github.com/advisories/GHSA-v626-r774-j7f8
github.com/tinymce/tinymce/releases/tag/5.10.9
github.com/tinymce/tinymce/releases/tag/6.7.3
github.com/tinymce/tinymce/security/advisories/GHSA-v626-r774-j7f8
nvd.nist.gov/vuln/detail/CVE-2023-48219
tiny.cloud/docs/release-notes/release-notes5109/
tiny.cloud/docs/tinymce/6/6.7.3-release-notes/
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
20.6%