Pull Request resolves # .

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

This pull request (PR) fixes one high severity security vulnerability in the indirect NPM non-development dependency "flatted" reported by npm audit by using npm audit fix.

In the 6.0-dev branch this has already been done with commit a305da2 in the upmerge PR #47402 .

Testing Instructions

It needs a development environment with a git clone, composer and npm.

1. If not done before, run composer install and npm ci.
2. Run npm audit.
3. Check the result.

Actual result BEFORE applying this Pull Request

# npm audit report

flatted  <3.4.0
Severity: high
flatted vulnerable to unbounded recursion DoS in parse() revive phase - https://github.com/advisories/GHSA-25h7-pfq9-p65f
fix available via `npm audit fix`
node_modules/flatted

tinymce  <7.0.0
Severity: moderate
TinyMCE Cross-Site Scripting (XSS) vulnerability in handling external SVG files through Object or Embed elements - https://github.com/advisories/GHSA-5359-pvf2-pw78
fix available via `npm audit fix --force`
Will install tinymce@8.3.2, which is a breaking change
node_modules/tinymce

2 vulnerabilities (1 moderate, 1 high)

To address issues that do not require attention, run:
  npm audit fix

To address all issues (including breaking changes), run:
  npm audit fix --force

Expected result AFTER applying this Pull Request

# npm audit report

tinymce  <7.0.0
Severity: moderate
TinyMCE Cross-Site Scripting (XSS) vulnerability in handling external SVG files through Object or Embed elements - https://github.com/advisories/GHSA-5359-pvf2-pw78
fix available via `npm audit fix --force`
Will install tinymce@8.3.2, which is a breaking change
node_modules/tinymce

1 moderate severity vulnerability

To address all issues (including breaking changes), run:
  npm audit fix --force

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed