{"id":"UBUNTU-CVE-2026-49284","details":"SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.","modified":"2026-09-15T20:16:36.905670413Z","published":"2026-07-17T20:17:00Z","upstream":["CVE-2026-49284"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-49284"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-49284"},{"type":"REPORT","url":"https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrm"}],"affected":[{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.2-1","1.14.0-1","1.14.0-1ubuntu2","1.14.0-1ubuntu2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"simplesamlphp","binary_version":"1.14.0-1ubuntu2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49284.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14.15-1","1.15.0-1","1.15.1-1","1.15.2-1","1.15.3-1","1.15.3-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"simplesamlphp","binary_version":"1.15.3-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49284.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.17.5-1","1.17.6-1","1.17.6-2","1.18.1-1","1.18.4-1","1.18.4-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"simplesamlphp","binary_version":"1.18.4-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49284.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.19.1-1","1.19.1-1.1","1.19.1-1.1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"simplesamlphp","binary_version":"1.19.1-1.1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49284.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.19.7-1","1.19.7-1+deb12u1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.19.7-1+deb12u1ubuntu0.1","binary_name":"simplesamlphp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49284.json"}},{"package":{"name":"simplesamlphp","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/simplesamlphp?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.19.7-2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.19.7-2","binary_name":"simplesamlphp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49284.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}