Java
CVE-2026-62263
CRITICAL
GHSA-gf8h-gq53-288j
Lifecycle Timeline
3DescriptionCVE.org
Summary
The GHSA-6c99-87fr-6q7r fix wrapped WebAuthn authenticator deserialization in an ObjectInputFilter meant to allow only AuthenticatorImpl, but it short-circuits to ALLOWED for any object at stream depth > 1. Because the Java serialization filter is consulted for every class in the graph (and depth == 1 only for the root's concrete class), the allowlist constrains only the root and leaves the entire nested graph unchecked.
Impact
An attacker can craft a stream rooted at AuthenticatorImpl with an arbitrary gadget chain nested inside. The gadget's readObject/readResolve executes during readObject() - before the cast and before any assertion verification - enabling remote code execution when a gadget is on the classpath. The deserialization sink is reached pre-authentication via an attacker-chosen userHandle.
AnalysisAI
Remote code execution in OpenAM's WebAuthn authentication module allows unauthenticated attackers to bypass an incomplete deserialization filter. The filter only constrains the root object, letting any nested gadget chain execute if a vulnerable library is on the classpath, leading to full server compromise. …
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External POC / Exploit Code
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