{"id":18162,"date":"2026-09-08T08:30:37","date_gmt":"2026-09-08T00:30:37","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-82756"},"modified":"2026-09-08T08:30:37","modified_gmt":"2026-09-08T00:30:37","slug":"cve-2026-82756","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-82756","title":{"rendered":"CVE-2026-82756 &#8211; Improper Encoding or Escaping of Output vulnerability in ash-project ash_authentication_oa"},"content":{"rendered":"<p>Improper Encoding or Escaping of Output vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to inject arbitrary authentication parameters into the WWW-Authenticate challenge header.<\/p>\n<p>BearerPlug and RequireScopePlug built the Bearer resource_metadata=&#8221;&#8230;&#8221; challenge by interpolating a resource_metadata URL derived from the request tenant directly into the quoted value. In a multi-tenant application that sets the Ash tenant from request-controlled data (a subdomain, the Host, a path segment, or a header), a tenant containing a &#8221; closes the quoted value and appends attacker-chosen auth-params, including a second resource_metadata URL pointing at an attacker-controlled authorization server that spec-following clients follow. Carriage returns and line feeds are rejected by Plug, so this is parameter injection within one header, not response splitting.<\/p>\n<p>This issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Improper Encoding or Escaping of Output vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to inject arbitrary authentication parameters into the WWW-Auth<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-18162","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/18162","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=18162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=18162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=18162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}