GHSA-9hcv-j9pv-qmph
MEDIUMTinyMCE Cross-Site Scripting (XSS) vulnerability using noneditable_regexp option
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
tinymce📦tinymce📦tinymce.NETTinyMCE.NETTinyMCE.NETTinyMCE🐘tinymce/tinymce🐘tinymce/tinymce+2 moreReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
Description
Impact
A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s content extraction code. When using the noneditable_regexp option, specially crafted HTML attributes containing malicious code were able to be executed when content was extracted from the editor.
Patches
This vulnerability has been patched in TinyMCE 7.2.0, TinyMCE 6.8.4 and TinyMCE 5.11.0 LTS by ensuring that, when using the noneditable_regexp option, any content within an attribute is properly verified to match the configured regular expression before being added.
Fix
To avoid this vulnerability:
- Upgrade to TinyMCE 7.2.0 or higher.
- Upgrade to TinyMCE 6.8.4 or higher for TinyMCE 6.x.
- Upgrade to TinyMCE 5.11.0 LTS or higher for TinyMCE 5.x (only available as part of commercial long-term support contract).
References
For more information
If you have any questions or comments about this advisory:
- Email us at [email protected]
- Open an issue in the TinyMCE repo
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | tinymce | all versions | 5.11.0 |
| 📦npm | tinymce | ≥ 6.0.0&&< 6.8.4 | 6.8.4 |
| 📦npm | tinymce | ≥ 7.0.0&&< 7.2.0 | 7.2.0 |
| .NETNuGet | TinyMCE | all versions | 5.11.0 |
| .NETNuGet | TinyMCE | ≥ 6.0.0&&< 6.8.4 | 6.8.4 |
| .NETNuGet | TinyMCE | ≥ 7.0.0&&< 7.2.0 | 7.2.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for tinymce. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update tinymce to 5.11.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9hcv-j9pv-qmph is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-9hcv-j9pv-qmph is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-9hcv-j9pv-qmph. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-9hcv-j9pv-qmph in your dependencies?
O3 detects GHSA-9hcv-j9pv-qmph across npm, NuGet, Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.