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Advisory record · GHSA-mf2p-h6hf-fcwm

TinyMCE Cross-Site Scripting (XSS) vulnerability using media plugin `data-mce-object` serialization

CVSS 8.5 HighEPSS 0.0035 · 28th percentile

Published by the GitHub Advisory Database at 27 Oct 2026, 21:07 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
tinymcenpm>=8.5.1, <8.9.3 || >=7.9.3, <7.9.48.9.3, 7.9.4
TinyMCENuGet>=8.5.1, <8.9.3 || >=7.9.3, <7.9.48.9.3, 7.9.4
tinymce/tinymcePackagist>=8.5.1, <8.9.3 || >=7.9.3, <7.9.48.9.3, 7.9.4
Identifiers
GHSA-mf2p-h6hf-fcwm · CVE-2026-116675 · PKSA-bdqg-yq3b-xsg6
Weakness (CWE)
CWE-79
Tags
Published
27 Oct 2026
Updated
27 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

TinyMCE's media plugin is vulnerable to stored cross-site scripting in the npm, NuGet and Packagist packages tinymce and TinyMCE, in versions 7.9.3 before 7.9.4 and 8.5.1 before 8.9.3. An attacker who can supply content crafted through the data-mce-object attribute can inject scripts that run before sanitization, affecting users of editors with the media plugin enabled. Upgrade to TinyMCE 7.9.4 or 8.9.3 or later, as no official workaround is available.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.5 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 28th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.