# CVE-2026-116675: TinyMCE Cross-Site Scripting (XSS) vulnerability using media plugin `data-mce-object` serialization


- **Severity:** High 8.5 (`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`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 27 Oct 2026
- **Updated:** 28 Oct 2026
- **Also known as:** GHSA-mf2p-h6hf-fcwm, UBUNTU-CVE-2026-116675

## What is CVE-2026-116675?

CVE-2026-116675 is a high-severity vulnerability in tinymce, published on 27 Oct 2026. 

### Official description

TinyMCE is an open source rich text editor. From 7.9.3 until 7.9.4 and from 8.5.1 until 8.9.3, the media plugin creates elements crafted through data-mce-object in the active document before sanitization. Those elements can execute malicious scripts during processing, resulting in stored cross-site scripting for users with the media plugin enabled. This issue is fixed in versions 8.9.3 and 7.9.4.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-116675?

12 open source packages ship an affected version, including TinyMCE, tinymce/tinymce and tinymce.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `TinyMCE` | NuGet | From 7.9.3 | 7.9.4 |
| `TinyMCE` | NuGet | From 7.9.3 | 7.9.4 |
| `TinyMCE` | NuGet | From 8.5.1 | 8.9.3 |
| `TinyMCE` | NuGet | From 8.5.1 | 8.9.3 |
| `tinymce/tinymce` | Packagist | From 7.9.3 | 7.9.4 |
| `tinymce/tinymce` | Packagist | From 7.9.3 | 7.9.4 |
| `tinymce/tinymce` | Packagist | From 8.5.1 | 8.9.3 |
| `tinymce/tinymce` | Packagist | From 8.5.1 | 8.9.3 |
| `tinymce` | npm | From 7.9.3 | 7.9.4 |
| `tinymce` | npm | From 7.9.3 | 7.9.4 |
| `tinymce` | npm | From 8.5.1 | 8.9.3 |
| `tinymce` | npm | From 8.5.1 | 8.9.3 |

## How do I fix CVE-2026-116675?

Upgrade TinyMCE to a fixed version for your release line: 7.9.4 or 8.9.3.

## Is CVE-2026-116675 being exploited?

There is no known exploitation of CVE-2026-116675 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-116675 and fix it if it is affected.

What it is: CVE-2026-116675 is a high-severity vulnerability in tinymce, published on 27 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-116675 in the wild and no public exploit code.

Affected packages and fixed versions:
- TinyMCE (NuGet): affected from 7.9.3; fixed in 7.9.4
- TinyMCE (NuGet): affected from 7.9.3; fixed in 7.9.4
- TinyMCE (NuGet): affected from 8.5.1; fixed in 8.9.3
- TinyMCE (NuGet): affected from 8.5.1; fixed in 8.9.3
- tinymce/tinymce (Packagist): affected from 7.9.3; fixed in 7.9.4
- tinymce/tinymce (Packagist): affected from 7.9.3; fixed in 7.9.4
- tinymce/tinymce (Packagist): affected from 8.5.1; fixed in 8.9.3
- tinymce/tinymce (Packagist): affected from 8.5.1; fixed in 8.9.3
- tinymce (npm): affected from 7.9.3; fixed in 7.9.4
- tinymce (npm): affected from 7.9.3; fixed in 7.9.4
- tinymce (npm): affected from 8.5.1; fixed in 8.9.3
- tinymce (npm): affected from 8.5.1; fixed in 8.9.3

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-116675/ (Markdown: https://insights.sbomify.com/CVE-2026-116675/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-116675
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-116675
- OSV: https://osv.dev/vulnerability/CVE-2026-116675

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-116675/
Summaries are generated and may contain mistakes; the official description above is the record.