CVE-2026-44203: OpenAM has pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)
Summary 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 formpost response mode. This may allow an attacker to inject content into the rendered page in the context of the OpenAM origin.
Published Jun 22, 2026
Affected packages
org.openidentityplatform.openam:openam-oauth2
- Ecosystem
- Maven
- Affected
- >= 13.0.0, < 16.1.1
- Fixed in
- 16.1.1
- Check
mvn dependency:tree -Dincludes=org.openidentityplatform.openam:openam-oauth2
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
Summary
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.
Credited to gujjuboy10x00, wodzen.
References
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology