Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M
CVE-2026-47426OpenAM OAuth Client Impersonation via JWKS Resolver Cache
High 7.6
In plain English
A high-severity improper authentication in OpenAM from OpenIdentityPlatform. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.openidentityplatform.openam:openam-oauth2 | 16.1.1 | GHSA-f2cx-463q-7m2c |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenIdentityPlatform | OpenAM | < 16.1.1 |
Weakness: CWE-287 · Vector: 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
References
- https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-f2cx-463q-7m2c x_refsource_CONFIRM
- https://github.com/OpenIdentityPlatform/OpenAM/commit/91acaf499162097ec83bcd729275ba7a12e1bd21 x_refsource_MISC
- https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1 x_refsource_MISC