Auth/Yadis/XML.php in PHP OpenID Library 2.2.2 and earlier allows remote attackers to read arbitrary files, send HTTP requests to intranet servers, or cause a denial of service (CPU and memory consumption) via XRDS data containing an external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue.
https://github.com/advisories/GHSA-5qp6-78pr-gv8c
https://github.com/openid/php-openid/commit/625c16bb28bb120d262b3f19f89c2c06cb9b0da9
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-2640
http://lists.opensuse.org/opensuse-updates/2016-08/msg00083.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00028.html