{"id":"CVE-2026-44203","title":"Open Access Management (OpenAM) is an access management solution","summary":"Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the OAuth 2.0 and OpenID Connect authorization endpoint does not sufficiently encode user-supplied parameters before FormPostResponse.ftl and checkSession…","severity":"high","cvss":8.3,"cvssVector":"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","cwe":["CWE-79"],"vendor":"OpenIdentityPlatform","product":"OpenAM","affected":["OpenAM < 16.1.1"],"patched":["org.openidentityplatform.openam:openam-oauth2 16.1.1"],"published":"2026-09-15","updated":"2026-09-23","sourceUpdated":"2026-09-23T18:19:19.803","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44203","references":[{"url":"https://github.com/OpenIdentityPlatform/OpenAM/commit/078bd4754905f5130eaa7bbe45f958eaeb7fd0d7","label":"security-advisories@github.com"},{"url":"https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1","label":"security-advisories@github.com"},{"url":"https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-fq9h-c788-fx73","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-fq9h-c788-fx73"}],"tags":["nvd","cve.org","ghsa","maven"],"epss":0.00466,"epssPercentile":0.39539,"ecosystem":"maven","cvssSource":"cna","scores":{"cna":8.3,"ghsa":9.3},"ingestedAt":"2026-06-29T13:24:35.515Z","slug":"CVE-2026-44203","body":"## Overview\n\nOpen Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the OAuth 2.0 and OpenID Connect authorization endpoint does not sufficiently encode user-supplied parameters before FormPostResponse.ftl and checkSession.ftl render them into HTML for the form_post response mode. An unauthenticated attacker can induce a user to open a crafted authorization request and execute script in the OpenAM origin. This issue is fixed in version 16.1.1.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-44203)\n\nAffected packages:\n\n- `org.openidentityplatform.openam:openam-oauth2 >= 13.0.0, < 16.1.1`\n\nPatched in:\n\n- `org.openidentityplatform.openam:openam-oauth2 16.1.1`\n\nSource: https://github.com/advisories/GHSA-fq9h-c788-fx73","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":45.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":203544,"id":"CVE-2026-44203","ts":1789468562386,"field":"cvss","old":"9.3","new":"8.3"},{"seq":203543,"id":"CVE-2026-44203","ts":1789468562386,"field":"severity","old":"critical","new":"high"}]}