🛡️ CVE-2026-62263 — openam-auth-webauthn

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-502 OSV

9.5

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

OpenAM: WebAuthn Java deserialization RCE via ObjectInputFilter depth>1 bypass

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-62263 is classified as CWE-502: Deserialization of Untrusted Data. Serialised data from an untrusted source is reconstructed into objects, which can trigger code during the process.

Affected software

CVE-2026-62263 is recorded against 1 package.

org.openidentityplatform.openam:openam-auth-webauthn (fixed in 16.1.2)

Timeline and source

Published on 24 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity CRITICAL

CVSS Score 9.5

CVSS 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

CWE CWE-502

Public Exploit ✅ No

Source OSV

Published 2026-07-24

Updated 2026-08-12

Modified 2026-07-24

Fix URL N/A

Affected Packages

Software	From version	Fixed in
org.openidentityplatform.openam:openam-auth-webauthn	—	16.1.2

References

WEB https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf8h-gq53-288j

WEB https://github.com/OpenIdentityPlatform/OpenAM/commit/9dd0fbe07f70f118cf45042d3a9ffb32f3c21e08

PACKAGE https://github.com/OpenIdentityPlatform/OpenAM

WEB https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.2

🔗 NVD 🔗 Mitre

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Exploit Protection

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