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High, CVSS 8.7amended

TinyMCE Cross-Site Scripting (XSS) vulnerability using through data-mce- prefixed src, href, style attributes

CVE-2026-47759GHSA-q742-qvgc-gc2f

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • NuGet tinymce

    Affected
    >= 6.0.0, < 7.9.3>= 8.0.0, < 8.5.1<= 5.10.9
    Fixed in
    7.9.3, 8.5.1

  • Packagist tinymce/tinymce

    Affected
    >= 6.0.0, < 7.9.3>= 8.0.0, < 8.5.1<= 5.10.9
    Fixed in
    7.9.3, 8.5.1

  • npm tinymce

    Affected
    >= 6.0.0, < 7.9.3>= 8.0.0, < 8.5.1<= 5.10.9
    Fixed in
    7.9.3, 8.5.1

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.7 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
EPSS
  • CVE-2026-47759: 0.28% estimated exploitation activity in the next 30 days; percentile 20.71 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact Stored XSS vulnerability via unsanitized data-mce- attributes (data-mce-href, data-mce-src, data-mce-style). Allows attackers to inject malicious values that override safe attributes during serialization, bypassing validation. Patches Patched by stripping unsafe data-mce- attributes during parsing. Users should upgrade to the latest patched versions (5 LTS, 7.x, 8.x). Workarounds No official workaround available. Fix To avoid this vulnerability: Upgrade to TinyMCE 8.5.1 or higher. Upgrade to TinyMCE 7.9.3 or higher. Upgrade to TinyMCE 5.11.1 LTS or higher for TinyMCE 5.x (only available as part of commercial long-term support contract). Acknowledgements Tiny thanks Tadi Kadango (website) and Ivan Babenko for their help identifying this vulnerability.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-q742-qvgc-gc2f

  2. Revision 1 · created ·

    Published from osv record GHSA-q742-qvgc-gc2f

Agent brief

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# Patch Next advisory brief: CVE-2026-47759

Advisory: TinyMCE Cross-Site Scripting (XSS) vulnerability using through data-mce- prefixed src, href, style attributes
IDs: CVE-2026-47759, GHSA-q742-qvgc-gc2f
Record: https://patchnext.com/advisories/cve-2026-47759 (revision 2, source checked 26 Oct 2026, 12:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: tinymce 8.5.1, 7.9.3; tinymce/tinymce 8.5.1, 7.9.3; tinymce 8.5.1, 7.9.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet tinymce: affected >= 6.0.0, < 7.9.3; >= 8.0.0, < 8.5.1; <= 5.10.9; fixed in 7.9.3, 8.5.1
- Packagist tinymce/tinymce: affected >= 6.0.0, < 7.9.3; >= 8.0.0, < 8.5.1; <= 5.10.9; fixed in 7.9.3, 8.5.1
- npm tinymce: affected >= 6.0.0, < 7.9.3; >= 8.0.0, < 8.5.1; <= 5.10.9; fixed in 7.9.3, 8.5.1

## Suggested inspection (read-only)
- NuGet tinymce: check the installed version with your package manager.
- Packagist tinymce/tinymce: check the installed version with your package manager.
- `npm ls tinymce --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on tinymce, tinymce/tinymce.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-q742-qvgc-gc2f (OSV record GHSA-q742-qvgc-gc2f lists affected ranges: npm tinymce >=0 =6.0.0 =8.0.0 =0 =6.0.0 =8.0.0 =0 =6.0.0 =8.0.0 <8.5.1 (fixed))
- Verified: https://github.com/advisories/GHSA-q742-qvgc-gc2f (GitHub-reviewed advisory GHSA-q742-qvgc-gc2f lists affected ranges: npm tinymce >=6.0.0 =8.0.0 =0 =6.0.0 =8.0.0 =0 =6.0.0 =8.0.0 =0 <=5.10.9)

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