Sanitize could be made to perform XSS attacks if it received specially crafted input.
Ubuntu Security Notice USN-4543-1
September 25, 2020
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
Sanitize could be made to perform XSS attacks if it received specially
- ruby-sanitize: allowlist-based HTML and CSS sanitizer
Michał Bentkowski discovered that Sanitize did not properly sanitize some
math or svg HTML under certain circumstances. A remote attacker could
potentially exploit this to conduct cross-site scripting (XSS) attacks.
The problem can be corrected by updating your system to the following
Ubuntu 20.04 LTS:
In general, a standard system update will make all the necessary changes.