Unicode control character pasted in CKEditor prevents from publishing web content

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, 7.2.X, Master
• Fix Version/s: 7.0.0 DXP FP89, 7.0.10.13 DXP SP13, 7.0.X, 7.1.10 DXP FP15, 7.1.X, 7.2.10 DXP FP3, 7.2.1 CE GA2, 7.2.X, 7.3.10 DXP GA1, Master
• Component/s: CKEditor, Frontend Infrastructure
• Labels:
  • ee-ts
  • liferay-dxp-70-sp13
  • liferay-fixpack-de-89-7010
  • liferay-fixpack-dxp-15-7110
  • liferay-fixpack-dxp-3-7210
• Branch Version/s:
  7.2.x, 7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/79713

Reproduction steps:
1) Add a Web Content Display portlet to Welcome Page
2) Create a new Basic Web Content
3) Copy all the text from the for_reproduction.txt file (containing 'a<0x03>b') and paste to CKEditor
4) Publish

Expected behavior:
Remove the invalid characters and the publication is successful.

Current behavior:
The web content can't be published due to errors 'Your request failed to complete.' and 'Please enter valid content.'

Reproduced on:
 master