Description
The bbcode plugin in TinyMCE 3.5.8 does not properly enforce the TinyMCE security policy for the (1) encoding directive and (2) valid_elements attribute, which allows attackers to conduct cross-site scripting (XSS) attacks via application-specific vectors, as demonstrated using a textarea element.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tinymce | No fix yet | — |
| Ubuntu 18.04 LTS | tinymce | No fix yet | — |
| Ubuntu 16.04 LTS | tinymce | No fix yet | — |
References
- tinymce-htmlentities-xss(82744) vdb-entry
- http://www.madirish.net/554
- 20130311 XSS Vulnerability in TinyMCE mailing-list
- 91130 vdb-entry
- 58424 vdb-entry
- http://packetstormsecurity.com/files/120750/TinyMCE-3.5.8-Cross-Site-Scripting.html