{"id":18161,"date":"2026-09-08T08:30:37","date_gmt":"2026-09-08T00:30:37","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-82755"},"modified":"2026-09-08T08:30:37","modified_gmt":"2026-09-08T00:30:37","slug":"cve-2026-82755","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-82755","title":{"rendered":"CVE-2026-82755 &#8211; Use of Cache Containing Sensitive Information vulnerability in ash-project ash_authenticat"},"content":{"rendered":"<p>Use of Cache Containing Sensitive Information vulnerability in ash-project ash_authentication_oauth2_server allows a shared HTTP cache to serve one tenant&#8217;s OAuth discovery metadata to another tenant&#8217;s clients.<\/p>\n<p>The RFC 8414 and RFC 9728 metadata endpoints in AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter return tenant-specific values (issuer, authorization_endpoint, token_endpoint, jwks_uri) when a tenant is set, but sent them with Cache-Control: public, max-age=3600 and no Vary. When the tenant is derived from something other than the URL (a header or the Host) and a shared cache sits in front, the cache key is the URL alone, so a stored response for one tenant is served to another for up to an hour. Affected clients may then send authorization codes and secrets to the wrong tenant&#8217;s token endpoint and validate tokens against the wrong keys.<\/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>Use of Cache Containing Sensitive Information vulnerability in ash-project ash_authentication_oauth2_server allows a shared HTTP cache to serve one tenant&#8217;s OAuth discovery metadata to another tenant&#8217;<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-18161","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/18161","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=18161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=18161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=18161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}