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Advisory record · GHSA-f2cx-463q-7m2c

OpenAM OAuth Client Impersonation via JWKS Resolver Cache

CVSS 7.6 HighEPSS 0.0055 · 46th percentile

Published by the GitHub Advisory Database at 29 Jun 2026, 17:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.openidentityplatform.openam:openam-oauth2Maven<16.1.116.1.1
Identifiers
GHSA-f2cx-463q-7m2c · CVE-2026-47426
Weakness (CWE)
CWE-287
Tags
Published
29 Jun 2026
Updated
28 Oct 2026

Machine-written summary

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

OpenAM (org.openidentityplatform.openam:openam-oauth2) versions before 16.1.1 are vulnerable to an authentication flaw in the OAuth2 private_key_jwt client authentication path, where keys are published via jwks_uri. An attacker who holds any registered OAuth2 client, including one from open dynamic client registration where enabled, can mint access tokens in the name of another client without its signing key, in any realm hosted by the OpenAM process. Upgrade to 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
7.6 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0055, the 46th percentile, on 8 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.