# CVE-2026-44203: Open Identity Platform OpenAM Reflected XSS in OAuth2 state parameter

Source: https://junglewise.ai/threats/cve-2026-44203-open-identity-platform-openam-reflected-xss-in-oauth2-state  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-06-22  
License: CC BY 4.0 with a link back

CVE-2026-44203 · Severity: critical · CVSS 9.3 · Published 2026-09-15

OpenAM, an open-source access management solution, contains a security flaw in its login and authorization components. An attacker can use this vulnerability to inject malicious scripts into a user's browser session before they have even logged in. If successful, this could allow the attacker to steal sensitive session information, impersonate users, or perform unauthorized actions within the identity platform.

Technologies: [org.openidentityplatform.openam:openam-oauth2 (Maven)](https://junglewise.ai/threats/technologies/org-openidentityplatform-openam-openam-oauth2), [Open Identity Platform OpenAM](https://junglewise.ai/threats/technologies/openam). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven), [Open Identity Platform](https://junglewise.ai/threats/vendors/open-identity-platform).

## Quick answers

**Is CVE-2026-44203 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-44203 being exploited in the wild.

**How severe is CVE-2026-44203?** Critical severity, with a CVSS score of 9.3, published 15 September 2026.

**Which products and versions are affected?** org.openidentityplatform.openam:openam-oauth2 (Maven) >= 13.0.0, < 16.1.1, ECOSYSTEM:introduced=13.0.0,fixed=16.1.1; Open Identity Platform OpenAM >= 13.0.0, < 16.1.1.

**Is there a fix for CVE-2026-44203?** Yes. org.openidentityplatform.openam:openam-oauth2 (Maven): upgrade to 16.1.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-44203 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-44203?** Check whether you run org.openidentityplatform.openam:openam-oauth2 (Maven) or Open Identity Platform OpenAM at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- org.openidentityplatform.openam:openam-oauth2 (Maven): upgrade to 16.1.1 or later

  ```sh
  # set org.openidentityplatform.openam:openam-oauth2 to 16.1.1 in your pom.xml or build.gradle
  ```


## Technical details

A reflected cross-site scripting (XSS) vulnerability exists in the OpenAM OAuth2/OIDC authorization endpoint. The root cause is the insufficient sanitization of the 'state' parameter when the 'response_mode' is set to 'form_post', specifically within the 'FormPostResponse.ftl' template. A remote, unauthenticated attacker can exploit this by tricking a user into clicking a specially crafted link. This allows for the execution of arbitrary JavaScript in the context of the OpenAM origin, potentially leading to session hijacking or credential theft. The issue is fixed in version 16.1.1.

## Affected products

- Open Identity Platform OpenAM OAuth2 >= 13.0.0, < 16.1.1

## Identifiers

- CVE-2026-44203
- GHSA-fq9h-c788-fx73

## Timeline

- 2026-06-21: disclosed
- 2026-06-22: advisory

## References

- [https://api.github.com/users/gujjuboy10x00](https://api.github.com/users/gujjuboy10x00)
- [https://github.com/gujjuboy10x00](https://github.com/gujjuboy10x00)
- [https://api.github.com/users/gujjuboy10x00/gists%7B/gist_id%7D](https://api.github.com/users/gujjuboy10x00/gists%7B/gist_id%7D)
- [https://api.github.com/users/gujjuboy10x00/repos](https://api.github.com/users/gujjuboy10x00/repos)
- [https://avatars.githubusercontent.com/u/32534328?v=4](https://avatars.githubusercontent.com/u/32534328?v=4)
- [https://api.github.com/users/gujjuboy10x00/events%7B/privacy%7D](https://api.github.com/users/gujjuboy10x00/events%7B/privacy%7D)

## Related threats

- [OpenAM default credentials authentication bypass in built-in identities](https://junglewise.ai/threats/cve-2026-123553-openam-before-16-1-4-ships-built-in-identities-in-the-top-level)
- [OpenAM unauthenticated session token disclosure via WebSocket](https://junglewise.ai/threats/cve-2026-123551-openam-from-14-0-0-before-16-1-4-contains-an-information)
- [OpenAM SAML v2.0 service provider authentication bypass](https://junglewise.ai/threats/cve-2026-123550-openam-before-16-1-4-contains-an-authentication-bypass)
- [OpenAM self-registration attribute list enforcement bypass](https://junglewise.ai/threats/cve-2026-123549-openam-before-16-1-4-fails-to-enforce-the-valid-creation)
- [OpenAM open redirect via SAML RelayState](https://junglewise.ai/threats/cve-2026-123547-openam-before-16-1-4-contains-an-open-redirect-vulnerability)