{"id":"GHSA-fq9h-c788-fx73","aliases":["CVE-2026-44203"],"title":"OpenAM has pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"HIGH","description":"### Summary\n\nThe OAuth 2.0 / OpenID Connect authorization endpoint does not sufficiently sanitize certain user-supplied parameters before incorporating them into the HTML response generated for the `form_post` response mode. This may allow an attacker to inject content into the rendered page in the context of the OpenAM origin.","severity":"high","score":8.3,"published":"2026-06-22T20:11:49.000Z","modified":"2026-10-28T15:45:11.046Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Maven","name":"org.openidentityplatform.openam:openam-oauth2","sources":[{"name":"OSV · GHSA-fq9h-c788-fx73","url":"https://osv.dev/vulnerability/GHSA-fq9h-c788-fx73"}],"ranges":[{"events":[{"introduced":"13.0.0"},{"fixed":"16.1.1"}],"type":"ECOSYSTEM"}],"versions":["14.5.2","14.5.3","14.5.4","14.6.1","14.6.2","14.6.3","14.6.4","14.6.5","14.6.6","14.7.0","14.7.1","14.7.2","14.7.3","14.7.4","14.8.1","14.8.2","14.8.3","14.8.4","15.0.0","15.0.1","15.0.2","15.0.3","15.0.4","15.1.0","15.1.1","15.1.2","15.1.3","15.1.4","15.1.5","15.1.6","15.2.0","15.2.1","15.2.2","16.0.1","16.0.2","16.0.3","16.0.4","16.0.5","16.0.6","16.1.0"],"fixed":["16.1.1"]}],"sourceAffected":[],"references":["https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-fq9h-c788-fx73","https://nvd.nist.gov/vuln/detail/CVE-2026-44203","https://github.com/OpenIdentityPlatform/OpenAM/commit/078bd4754905f5130eaa7bbe45f958eaeb7fd0d7","https://github.com/OpenIdentityPlatform/OpenAM","https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1"],"sources":[{"name":"OSV","id":"GHSA-fq9h-c788-fx73","modified":"2026-10-28T15:45:11.046962368Z","url":"https://osv.dev/vulnerability/GHSA-fq9h-c788-fx73"}],"assessments":[{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N","score":8.3}],"products":[],"remediation":[],"observedAt":"2026-10-29T15:04:44.308Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T04:45:31.033Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-28T16:15:37.217Z","attemptedAt":"2026-10-28T16:15:37.217Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-28T16:15:37.254Z","attemptedAt":"2026-10-28T16:15:37.254Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-28T16:15:37.695Z","attemptedAt":"2026-10-28T16:15:37.695Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-28T16:15:37.047Z","attemptedAt":"2026-10-28T16:15:37.047Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-44203","url":"https://www.first.org/epss/","probability":0.00593,"percentile":0.48222,"date":"2026-10-28","checkedAt":"2026-10-28T16:15:37.047Z"},{"source":"NVD","id":"CVE-2026-44203","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44203","modified":"2026-09-23T18:19:19.803","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-10-28T16:15:37.217Z"},{"source":"GitHub Advisory Database","id":"GHSA-fq9h-c788-fx73","url":"https://github.com/advisories/GHSA-fq9h-c788-fx73","modified":"2026-10-28T15:28:39Z","checkedAt":"2026-10-28T16:15:37.254Z"},{"source":"ENISA EUVD","id":"EUVD-2026-78356","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-78356","modified":"Sep 17, 2026, 2:02:34 PM","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N","checkedAt":"2026-10-28T16:15:37.695Z"}],"aiSummary":null}