CVE-2026-47426 OpenAM OAuth Client Impersonation via JWKS Resolver Cache
Attackers can impersonate other OAuth clients and mint tokens by exploiting a cache binding flaw in OpenAM's JWKS resolver.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47426?
CVE-2026-47426 is a high-severity authentication bypass vulnerability in OpenIdentityPlatform OpenAM, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the private_key_jwt client authentication path uses ClientJwksResolverCache without reliably binding a cached jwks_uri resolver and verified assertion to the expected clientID in ClientCredentialsReader. An attacker controlling any registered client with published keys, including one obtained through open dynamic registration when enabled, can authenticate as another client whose keys are exposed through jwks_uri and mint tokens in that client's name across realms in the same OpenAM process. This issue is fixed in version 16.1.1.
Weakness: CWE-287
Which versions are affected by CVE-2026-47426?
2 open source packages ship an affected version, including org.openidentityplatform.openam:openam-oauth2.
| Package | Affected | Fixed in |
|---|---|---|
org.openidentityplatform.openam:openam-oauth2 Maven | All versions | 16.1.1 |
org.openidentityplatform.openam:openam-oauth2 Maven | All versions | 16.1.1 |
How do I fix CVE-2026-47426?
Upgrade org.openidentityplatform.openam:openam-oauth2 to 16.1.1 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-47426 being exploited?
There is no known exploitation of CVE-2026-47426 in the wild and no public exploit code.
Sources
Also known as GHSA-f2cx-463q-7m2c, UBUNTU-CVE-2026-47426.