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CVE-2026-44203 — OpenAM has pre-auth Reflected XSS in...

CRITICAL

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

Published June 22, 2026Updated June 22, 2026Source: osv

Summary

### 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.

Advisory Timeline

  • First published June 22, 2026 (112 days ago).
  • Last revised June 22, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven
Update org.openidentityplatform.openam:openam-oauth2 to 16.1.1 or later
<!-- Update pom.xml dependency version to 16.1.1 for org.openidentityplatform.openam:openam-oauth2 -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: maven (1).

PackageEcosystemAffectedFixed In
org.openidentityplatform.openam:openam-oauth2
maven
14.5.2, 14.5.3, 14.5.4, 14.6.1 (+36 more)16.1.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-79
    Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.3 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-44203?
OpenAM has pre-auth Reflected XSS in OAuth2 / OIDC response_mode=form_post via state parameter (FormPostResponse.ftl) This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.3/10).
How do I check if my project is affected by CVE-2026-44203?
CVE-2026-44203 affects org.openidentityplatform.openam:openam-oauth2. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-44203 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.3

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-fq9h-c788-fx73

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