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Advisory record · GHSA-39hr-239p-fhqc

OpenAM: Using arbitrary OIDC requested claims values in id_token and user_info is allowed

CVSS 8.1 HighEPSS 0.0035 · 29th percentile

Published by the GitHub Advisory Database at 12 Nov 2025, 21:27 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.openidentityplatform.openam:openam-oauth2Maven<16.0.316.0.3
Identifiers
GHSA-39hr-239p-fhqc · CVE-2025-64099
Weakness (CWE)
CWE-74 · CWE-94
Tags
Published
12 Nov 2025
Updated
15 Nov 2025

Machine-written summary

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

OpenAM's openam-oauth2 Maven package, versions before 16.0.3, lets a user inject arbitrary values into OIDC claims in id_token and user_info responses when claims_parameter_supported is enabled, because authorization requests do not block a claims parameter containing injected JSON. An attacker can craft that parameter to set claim values of their choice, such as an email address, and so impersonate another identity where clients trust those claims. Upgrade to version 16.0.3.

Written 7 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
8.1 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 29th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:09 UTC First seen by agentprime
  2. 31 Oct 2026, 15:09 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.