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Response snapshot Oct 28, 2026, 17:16 UTC

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VulnerabilityCVE-2026-45051

OpenAM: Pre-auth RCE via Java Deserialization in WebAuthn Authenticator Storage

Description A deserialization of untrusted data vulnerability (CWE-502) exists in OpenAM's WebAuthn authentication module. Under certain conditions, this may allow an attacker to achieve arbitrary code execution in the context of the application server.

At a glance

Exploited
Not known
Severity
9.2 Critical (CVSS 4.0)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: org.openidentityplatform.openam:openam-auth-webauthn: 16.1.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-6c99-87fr-6q7r (opens a new tab)

What happened

Summary

Description

A deserialization of untrusted data vulnerability (CWE-502) exists in OpenAM's WebAuthn authentication module. Under certain conditions, this may allow an attacker to achieve arbitrary code execution in the context of the application server. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.

This is not the default configuration. Exploitation requires that an attacker has previously been able to write attacker-controlled data to a storage attribute read by the WebAuthn module, and that the WebAuthn authentication flow is reachable.

Continue reading

Impact

WebAuthn is a modern shipped module, but the vulnerable configuration requires either the default storage attribute to become attacker-writable, or the WebAuthn userAttribute to be set to an attacker-writable string attribute.

That is not the default, but it is feasible in deployments because the product exposes the storage attribute as a free-form admin setting and does not warn or enforce that it must be server-managed and non-user-writable. This may exist through delegated administration, provisioning, write access to the backing LDAP/directory user record, legacy REST self-registration, or unsafe reconfiguration of userAttribute.

In any deployment where the attribute becomes user writable, an attacker can execute arbitrary code as the application server user.

Patch

This has been patched in OpenAM Community Edition version 16.1.1. Users are encouraged to update to the latest release.

Affected package ranges reported by GitHub: org.openidentityplatform.openam:openam-auth-webauthn: <= 16.0.6

Scores and how they were measured

CVSS base severity

9.2

Version 4.0As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-6c99-87fr-6q7r (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-6c99-87fr-6q7r, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). OpenAM: Pre-auth RCE via Java Deserialization in WebAuthn Authenticator Storage (CVE-2026-45051). https://kevwire.com/record/CVE-2026-45051

MLA

"OpenAM: Pre-auth RCE via Java Deserialization in WebAuthn Authenticator Storage (CVE-2026-45051)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-45051.

Chicago

KEVWire. "OpenAM: Pre-auth RCE via Java Deserialization in WebAuthn Authenticator Storage (CVE-2026-45051)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-45051.

Evidence summary (plain text)

OpenAM: Pre-auth RCE via Java Deserialization in WebAuthn Authenticator Storage (Jun 24, 2026).
Description

A deserialization of untrusted data vulnerability (CWE-502) exists in OpenAM's WebAuthn authentication module. Under certain conditions, this may allow an attacker to achieve arbitrary code execution in the context of the application server. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.

This is not the default configuration. Exploitation requires that an attacker has previously been able to write attacker-controlled data to a storage attribute read by the WebAuthn module, and that the WebAuthn authentication flow is reachable.
CVSS 9.2 (version 4.0; evidence as of Oct 28, 2026; https://github.com/advisories/GHSA-6c99-87fr-6q7r).
Sources:
GitHub-reviewed advisory GHSA-6c99-87fr-6q7r: https://github.com/advisories/GHSA-6c99-87fr-6q7r
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-45051.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 28, 2026, 16:55 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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