{"id":"CVE-2026-44203","aliases":["EUVD-2026-78356","GHSA-fq9h-c788-fx73","UBUNTU-CVE-2026-44203"],"status":"published","title":"OpenAM: Pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)","description":"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.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.","severity":{"version":"4.0","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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00593,"percentile":0.4882,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-06-22T20:11:49Z","modified":"2026-10-28T15:45:11Z","fixes":[{"ecosystem":"Maven","package":"org.openidentityplatform.openam:openam-oauth2","fixed_in":["16.1.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.openidentityplatform.openam:openam-oauth2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"16.1.1"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.openidentityplatform.openam:openam-oauth2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"16.1.1"}]}],"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"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"openam","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.0-1build6"]}],"products":[{"vendor":"openidentityplatform","product":"openam"}],"references":[{"url":"https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-fq9h-c788-fx73","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/OpenIdentityPlatform/OpenAM/commit/078bd4754905f5130eaa7bbe45f958eaeb7fd0d7","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44203","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-fq9h-c788-fx73"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44203.json","tags":["advisory"]},{"url":"https://github.com/OpenIdentityPlatform/OpenAM","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-44203","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-44203","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-44203","title":"OpenAM: Pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)","description":"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.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.","status":"published","published":"2026-09-15T09:48:07.329Z","modified":"2026-09-17T14:02:34.668Z","cvss":[{"version":"4.0","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","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:42:49.132798Z"}],"euvd":[{"id":"EUVD-2026-78356","description":"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.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.","status":"published","published":"2026-09-15T09:48:07Z","modified":"2026-09-17T14:02:34Z","cvss":[{"version":"4.0","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","level":"high"}],"updated_at":"2026-11-02T17:28:12.076337Z"}],"ghsa":[{"id":"GHSA-fq9h-c788-fx73","title":"OpenAM has pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)","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.","status":"published","published":"2026-06-22T20:11:49Z","modified":"2026-10-28T15:28:39Z","cvss":[{"version":"4.0","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","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:41:38.969831Z"}],"nvd":[{"id":"CVE-2026-44203","description":"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.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.","status":"published","published":"2026-09-15T10:17:03.51Z","modified":"2026-09-23T18:19:19.803Z","cvss":[{"version":"4.0","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","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:47.335523Z"}],"osv":[{"id":"CVE-2026-44203","title":"OpenAM: Pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)","description":"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.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.","status":"published","published":"2026-09-15T09:48:07.329Z","modified":"2026-10-28T02:30:45.870702316Z","cvss":[{"version":"4.0","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","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:04.820169Z"},{"id":"GHSA-fq9h-c788-fx73","title":"OpenAM has pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)","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.","status":"published","published":"2026-06-22T20:11:49Z","modified":"2026-10-28T15:45:11.046962368Z","cvss":[{"version":"4.0","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","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:46.760785Z"},{"id":"UBUNTU-CVE-2026-44203","description":"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.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.","status":"published","published":"2026-09-15T10:17:00Z","modified":"2026-09-24T02:00:27.011090256Z","cvss":[{"version":"4.0","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","level":"high"}],"updated_at":"2026-11-02T16:56:22.075798Z"}]}}