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Vulnerabilities

Vulnerability · CVE-2026-44203

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

Published Jun 22, 2026 · catalog updated Oct 28, 2026 · OpenAM has pre-auth Reflected

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-44203. EPSS is 0.59%. Act only if a listed version of OpenAM has pre-auth Reflected is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OpenAM has pre-auth Reflected).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.59%
Remediation
Advisory link
Affected products
Maven org.openidentityplatform.openam:openam-oauth2

### 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 response mode. This may allow an attacker to inject content into the rendered page in the context of the OpenAM origin.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Maven org.openidentityplatform.openam:openam-oauth213.0.0 → 16.1.1

How to fix CVE-2026-44203

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-44203. EPSS is 0.59%. Act only if a listed version of OpenAM has pre-auth Reflected is installed.

Which versions are affected?

Compare what you have installed with 13.0.0 → 16.1.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.59%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 22, 2026 · GitHub Advisory Database

    Detected

    ### 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 response mode. This may allow an attacker to inject content into the rendered page in the context of the OpenAM origin.

  2. Oct 28, 2026 · GitHub Advisory Database

    Fix available

    org.openidentityplatform.openam:openam-oauth2 fixed in 16.1.1

  3. Oct 28, 2026 · GitHub Advisory Database

    Fix available

    org.openidentityplatform.openam:openam-oauth2 fixed in 16.1.1

  4. Oct 28, 2026 · GitHub Advisory Database

    Updated

    ### 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 response mode. This may allow an attacker to inject content into the rendered page in the context of the OpenAM origin.

Sources

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 29, 2026
  • GitHub Advisory DatabaseOct 29, 2026
  • OpenSSF OSV / OSV ScannerOct 29, 2026