GHSA-gf8h-gq53-288j: org.openidentityplatform.openam:openam-auth-webauthn (CVE-2026-62263)

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

CVSS 9.2 CriticalCriticalEPSS 0.0086 · 58th percentile

Critical, because:

CVSS score 9.2: 9.0 or more.

Published by the GitHub Advisory Database at 24 Jul 2026, 21:08 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
org.openidentityplatform.openam:openam-auth-webauthn	Maven	<16.1.2	16.1.2

Identifiers

GHSA-gf8h-gq53-288j · CVE-2026-62263

Weakness (CWE)

CWE-502

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of openam-auth-webauthn before 16.1.2 in the Maven package org.openidentityplatform.openam:openam-auth-webauthn are affected. An unauthenticated remote attacker can send a crafted serialized object that runs arbitrary code during deserialization, provided a suitable gadget class is on the classpath. Upgrade to version 16.1.2, which fixes the issue.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.2	Critical	4.0	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	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0086, the 58th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:19 UTC First seen by agentprime
31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.