CVE-2026-62379: OpenAM: Unauthenticated Remote Code Execution via Class.forName in AuthXMLUtils.createCustomCallback

Should you act?

Critical and remotely reachable

No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
• EPSS 1.1%, percentile 64: FIRST’s model estimates a 1.1% chance of exploitation activity in the next 30 days, higher than 64% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Only applies if your dependency tree includes org.openidentityplatform.openam:openam-core (Maven) <= 16.1.1, fixed in 16.1.2. Check your lockfile, including transitive dependencies.

What it is

Open Access Management (OpenAM) is an access management solution. Prior to 16.1.2, the pre-authentication /authservice PLL endpoint accepts a CustomCallback XML element whose className value selects an arbitrary Java class for AuthXMLUtils to load and instantiate without verifying that it implements DSAMECallbackInterface. Default configurations expose the endpoint without authentication, allowing attacker-controlled class initialization and unsafe deserialization of a serialized Subject value to execute code in the server process. Enabling sunRemoteAuthSecurityEnabled does not prevent the vulnerable parsing and instantiation because its check occurs later. This issue is fixed in version 16.1.2.

From the GitHub advisory

Summary A pre-authentication remote code execution vulnerability affects OpenAM. The remote authentication endpoint (/authservice, PLL) accepts an XML element that names an arbitrary Java class, which the server then loads and instantiates without validation. On a default configuration this is reachable without authentication and allows an attacker to run code on the server.

Impact Unauthenticated remote code execution / full server compromise on any OpenAM instance with default settings.

Affected All releases up to and including 16.1.1 (the defect predates the Open Identity Platform fork).

Remediation Upgrade to 16.1.2. The fix resolves the class named in a element without running its static initialisers and rejects it unless it implements DSAMECallbackInterface, and it constrains deserialisation of the serialised Subject value to a class allowlist.

Interim mitigation If you cannot upgrade immediately:

Weakness type: CWE-94, CWE-470.

Product: org.openidentityplatform.openam:openam-core (Maven) · Assigned by: GitHub_M · Published: 2026-09-15

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Privileges required: none (no login)
• User interaction: none
• Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
• CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
• FIRST EPSS (model of 2026-10-21): 1.07% probability of exploitation activity in the next 30 days; percentile 64.

Timeline

• 2026-07-24 — GitHub-reviewed advisory GHSA-wg5r-wc3x-39vc published (critical)
• 2026-09-15 — CVE record last updated
• 2026-09-15 — CVE record published by GitHub_M

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vulnerability records

1. GitHub Advisory GHSA-wg5r-wc3x-39vc github.com
2. CVE.org record CVE-2026-62379 cve.org
3. NVD entry CVE-2026-62379 nvd.nist.gov

Other references from the CVE record and advisory

1. github.com github.com
2. github.com github.com
3. github.com github.com

Critical Maven advisories · Today’s Security Digest