The release notes state: "Props to Alex Concha of the WordPress Security Team for their work in hardening deserialization requests." This vulnerability affected the third-party "Requests for PHP" library used by WordPress.
Alex Concha of the WordPress Security Team
No
2020-10-29 (about 2 years ago)
2020-10-29 (about 2 years ago)
2021-04-29 (about 1 years ago)