CVE-2026-44203: OpenAM has pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)
(updated )
The 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.
References
- github.com/OpenIdentityPlatform/OpenAM/commit/078bd4754905f5130eaa7bbe45f958eaeb7fd0d7
- github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1
- github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-fq9h-c788-fx73
- github.com/advisories/GHSA-fq9h-c788-fx73
- nvd.nist.gov/vuln/detail/CVE-2026-44203
Code Behaviors & Features
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