CVE-2026-44203

OpenAM: Pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl)

Published: Sep 15, 2026Updated: Sep 23, 2026 Sources: CVE List NVDCWE-79

N/ACVSS

NVD MITRE

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.

No summary for this CVE yet.

Weaknesses

CWE-79

Affected Products

OpenIdentityPlatform

commercial

OpenAMOn-prem

Security Products / identity-access-mgmt

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-fq9h-c788-fx73

github.com

https://github.com/OpenIdentityPlatform/OpenAM/commit/078bd4754905f5130eaa7bbe45f958eaeb7fd0d7

github.com

https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1

github.com

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