CVE-2026-62263: OpenIdentityPlatform OpenAM Java deserialization RCE in WebAuthn

CVE-2026-62263 · Severity: critical · CVSS 4 · Published 2026-09-15

OpenAM is an open-source access management solution. A security flaw in its WebAuthn authentication component allows an unauthenticated attacker to execute arbitrary code on the server. This could lead to a complete system takeover, theft of sensitive user data, and disruption of authentication services.

Vendors: Maven, Open Identity Platform.

Quick answers

Is CVE-2026-62263 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-62263 being exploited in the wild.
How severe is CVE-2026-62263?
Critical severity, with a CVSS score of 4, published 15 September 2026.
Which products and versions are affected?
org.openidentityplatform.openam:openam-auth-webauthn (Maven) <= 16.1.1, ECOSYSTEM:introduced=0,fixed=16.1.2; Open Identity Platform OpenAM WebAuthn Authentication Module <= 16.1.1.
Is there a fix for CVE-2026-62263?
Yes. org.openidentityplatform.openam:openam-auth-webauthn (Maven): upgrade to 16.1.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-62263 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-62263?
Check whether you run org.openidentityplatform.openam:openam-auth-webauthn (Maven) or Open Identity Platform OpenAM WebAuthn Authentication Module at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.openidentityplatform.openam:openam-auth-webauthn (Maven): upgrade to 16.1.2 or later
    # set org.openidentityplatform.openam:openam-auth-webauthn to 16.1.2 in your pom.xml or build.gradle

Technical details

The vulnerability exists in the WebAuthn authenticator deserialization logic. While an ObjectInputFilter was implemented to restrict deserialization to the AuthenticatorImpl class, the filter contains a logic error that automatically allows any object at a stream depth greater than 1. An attacker can exploit this by crafting a serialized stream rooted at AuthenticatorImpl that contains a malicious gadget chain nested within it. Since the filter is bypassed for nested objects, the gadget's readObject or readResolve methods execute before any type casting or validation occurs. This allows for unauthenticated RCE via an attacker-controlled userHandle. The issue is patched in version 16.1.2.

Affected products

  • OpenIdentityPlatform openam-auth-webauthn <= 16.1.1

Identifiers

  • CVE-2026-62263
  • GHSA-gf8h-gq53-288j

Timeline

  • 2026-07-23: patched: Fixed in version 16.1.2
  • 2026-07-24: advisory: GitHub Advisory published

References

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