cve.bz

CVE-2023-45818

6.1 mediumEPSS 0.8%

Medium (6.1) in tiny tinymce. EPSS 0.8% chance of exploitation in the next 30 days. Fixed in tinymce 5.10.8, 6.7.1.

TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo and redo functionality. When a carefully-crafted HTML snippet passes the XSS sanitisation layer, it is manipulated as a string by internal trimming functions before being stored in the undo stack. If the HTML snippet is restored from the undo stack, the combination of the string manipulation and reparative parsing by either the browser's native [DOMParser API](https://developer.mozilla.org/en-US/docs/Web/API/DOMParser) (TinyMCE 6) or the SaxParser API (TinyMCE 5) mutates the HTML maliciously, allowing an XSS payload to be executed. This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring HTML is trimmed using node-level manipulation instead of string manipulation. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Severity

CVSS 3.1

6.1 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)
CWE
CWE-79
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-v65r-p3vv-jjfvnpmtinymce>=6.0.0 <6.7.16.7.1
GHSA-v65r-p3vv-jjfvNuGetTinyMCE>=6.0.0 <6.7.16.7.1
GHSA-v65r-p3vv-jjfvPackagisttinymce/tinymce>=6.0.0 <6.7.16.7.1
GHSA-v65r-p3vv-jjfvnpmtinymce<5.10.85.10.8
GHSA-v65r-p3vv-jjfvNuGetTinyMCE<5.10.85.10.8
GHSA-v65r-p3vv-jjfvPackagisttinymce/tinymce<5.10.85.10.8

References

Check your stackJSON