CVE-2026-62263: OpenAM Remote Code Execution Vulnerability

CRITICAL
Advisory Identifier: GHSA-gf8h-gq53-288j
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CWE-502
Published
Advisory Summary

CVE-2026-62263 is a CRITICAL remote code execution vulnerability (CWE-502: Deserialization of Untrusted Data) affecting OpenAM libraries in the Maven ecosystem. The issue involves webauthn java deserialization rce via objectinputfilter depth>1 bypass. Remediation is available by upgrading affected packages to version 16.1.2.

CVE-2026-62263 at a Glance

CVE Identifier CVE-2026-62263
GHSA Identifier GHSA-gf8h-gq53-288j
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product OpenAM
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-62263

To remediate this vulnerability, upgrade all affected OpenAM dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.openidentityplatform.openam:openam-auth-webauthn fixed: 16.1.2 
<dependency>
    <groupId>org.openidentityplatform.openam</groupId>
    <artifactId>openam-auth-webauthn</artifactId>
    <version>16.1.2</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.openidentityplatform.openam

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-62263, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.openidentityplatform.openam

Analyze the terminal output to locate any version of OpenAM in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 16.1.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.openidentityplatform.openam command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In OpenAM, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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`.

CVE-2026-62263 Affected OpenAM Versions

1 component(s)
Fixed Versions:
16.1.2
Product / Package Ecosystem Affected Versions Fixed Version
org.openidentityplatform.openam:openam-auth-webauthn
maven/org.openidentityplatform.openam/openam-auth-webauthn
Maven
< 16.1.2
16.1.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf8h-gq53-288j
Security Fix Commit FIX COMMIT
https://github.com/OpenIdentityPlatform/OpenAM/commit/9dd0fbe07f70f118cf45042d3a9ffb32f3c21e08
OpenAM Source Repository REPOSITORY
https://github.com/OpenIdentityPlatform/OpenAM
OpenAM Release RELEASE
https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.2

Frequently Asked Questions

What is CVE-2026-62263?
CVE-2026-62263 is a security vulnerability in OpenAM involving WebAuthn Java deserialization RCE via ObjectInputFilter depth>1 bypass under CWE-502: Deserialization of Untrusted Data.
Which OpenAM versions are affected?
Affected versions include releases prior to 16.1.2 across affected packages: org.openidentityplatform.openam:openam-auth-webauthn.
What version fixes CVE-2026-62263?
Upgrading to 16.1.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is openam-auth-webauthn affected?
Yes, org.openidentityplatform.openam:openam-auth-webauthn is affected in releases prior to 16.1.2. Upgrade your dependency to 16.1.2 or later.
What CWE is associated with CVE-2026-62263?
CVE-2026-62263 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Maven dependencies for CVE-2026-62263?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.openidentityplatform.openam'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-gf8h-gq53-288j",
  "modified" : "2026-07-24T21:08:46Z",
  "published" : "2026-07-24T21:08:46Z",
  "aliases" : [ "CVE-2026-62263" ],
  "summary" : "OpenAM: WebAuthn Java deserialization RCE via ObjectInputFilter depth>1 bypass",
  "details" : "### Summary\nThe 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.\n\n### Impact\nAn 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`.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.openidentityplatform.openam:openam-auth-webauthn"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "16.1.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 16.1.1"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf8h-gq53-288j"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OpenIdentityPlatform/OpenAM/commit/9dd0fbe07f70f118cf45042d3a9ffb32f3c21e08"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/OpenIdentityPlatform/OpenAM"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-24T21:08:46Z",
    "nvd_published_at" : null
  }
}