Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M
CVE-2026-45051OpenAM Pre-auth RCE via Java Deserialization in WebAuthn Authenticator Storage
Critical 9.2
In plain English
A critical-severity unsafe deserialization 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 0.7% (higher than 53% 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, WebAuthnAuthentication loads a serialized AuthenticatorImpl object graph from the configured userAttribute through loadAuthenticators without an ObjectInputFilter. Exploitation requires the WebAuthn flow to be reachable and an attacker to have previously written controlled data to that attribute through delegated administration, provisioning, directory access, legacy REST self-registration, or unsafe configuration. When those non-default conditions hold, the data is deserialized before assertion verification and can execute a classpath gadget in the application server process. This issue is fixed in version 16.1.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.openidentityplatform.openam:openam-auth-webauthn | 16.1.1 | GHSA-6c99-87fr-6q7r |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenIdentityPlatform | OpenAM | < 16.1.1 |
Weakness: CWE-502 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-6c99-87fr-6q7r x_refsource_CONFIRM
- https://github.com/OpenIdentityPlatform/OpenAM/commit/8b02328d36bc9cd40602128a6d399d1eda9e6753 x_refsource_MISC
- https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1 x_refsource_MISC