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Advisory record · GHSA-fq9h-c788-fx73

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

CVSS 8.3 HighEPSS 0.0059 · 48th percentile

Published by the GitHub Advisory Database at 22 Jun 2026, 20:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.openidentityplatform.openam:openam-oauth2Maven>=13.0.0, <16.1.116.1.1
Identifiers
GHSA-fq9h-c788-fx73 · CVE-2026-44203
Weakness (CWE)
CWE-79
Tags
Published
22 Jun 2026
Updated
28 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

OpenAM's openam-oauth2 Maven package, versions 13.0.0 up to 16.1.1 (exclusive), is affected by a reflected cross-site scripting flaw in the OAuth 2.0 and OpenID Connect authorization endpoint when the form_post response mode is used. The source gives few details beyond the fact that user-supplied parameters are not sufficiently sanitized before being placed in the generated HTML page. An unauthenticated attacker could potentially inject content into the page under the OpenAM origin by getting a user to open a crafted link. Upgrade to openam-oauth2 version 16.1.1.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.3 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0059, the 48th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.