TinyMCE Cross-Site Scripting (XSS) vulnerability through `mce:protected` comments

published 2026-05-28 5 mo ago modified 2026-10-14 25 d ago also GHSA-v98h-vmpc-fpqv , EUVD-2026-32923

cvss: 8.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits: 0; none known

TinyMCE is an open source rich text editor. Prior to 5.11.1, 7.9.3, and 8.5.1, there is a stored XSS vulnerability via forged mce:protected comments. Allows attackers to bypass sanitization and inject scripts that execute when content is restored. Impacts users who utilize the protect option. This vulnerability is fixed in 5.11.1, 7.9.3, and 8.5.1.

Patch / fix

fixed in 4

npm tinymce 7.9.3, 8.5.1
nuget TinyMCE 7.9.3, 8.5.1
packagist tinymce/tinymce 7.9.3, 8.5.1
tiny tinymce 5.11.1, 7.9.3, 8.5.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-47762 updated 2026-11-06 cvss 5.4

TinyMCE: Cross-Site Scripting (XSS) vulnerability through mce:protected comments

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 5 mo ago (2026-05-28)

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.7	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
GitHub	3.1	8.7	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	tinymce	<=5.10.9 >=6.0.0, <7.9.3 >=8.0.0, <8.5.1	7.9.3 8.5.1
nuget	TinyMCE	<=5.10.9 >=6.0.0, <7.9.3 >=8.0.0, <8.5.1	7.9.3 8.5.1
packagist	tinymce/tinymce	<=5.10.9 >=6.0.0, <7.9.3 >=8.0.0, <8.5.1	7.9.3 8.5.1

Affected products

tinymce tinymce

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /tinymce/tinymce/security/advisories/GHSA-v98h-vmpc-fpqv
web, vendor-advisory
tiny.cloud /docs/tinymce/7/7.9.3-release-notes/#overview
web, release-notes
tiny.cloud /docs/tinymce/8/8.5.1-release-notes/#overview
web, release-notes
nvd.nist.gov /vuln/detail/CVE-2026-47762
advisory
github.com /tinymce/tinymce
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary