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Response snapshot Oct 28, 2026, 17:16 UTC

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VulnerabilityCVE-2026-46560

OpenAM: Unauthenticated Authentication Bypass via RADIUS Spoofing

Description An Improper Verification of Cryptographic Signature (CWE-347) issue in OpenAM's RADIUS authentication module allows an unauthenticated network attacker to spoof an Access-Accept response and obtain an OpenAM session for any RADIUS username, without knowing the configured shared secret.

At a glance

Exploited
Not known
Severity
7.5 High (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

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

Read GitHub-reviewed advisory GHSA-386j-6m86-78f9 (opens a new tab)

What happened

Summary

Description

An Improper Verification of Cryptographic Signature (CWE-347) issue in OpenAM's RADIUS authentication module allows an unauthenticated network attacker to spoof an Access-Accept response and obtain an OpenAM session for any RADIUS username, without knowing the configured shared secret. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.

The RADIUS client opens an unconnected datagram socket and treats the first UDP datagram delivered to its source port as authoritative. The receive path does not check the source IP/port, does not match the response identifier to the outstanding request, and does not verify the Response Authenticator (RFC 2865 §3); the RFC 2869 Message-Authenticator is neither sent nor required.

Continue reading

Any non-Reject/non-Challenge packet is treated as success, so a forged Access-Accept is accepted as a valid login.

Impact

OpenAM Community Edition deployments through version 16.0.6 where an administrator has enabled a RADIUS module instance on a login chain are potentially affected. An attacker either races the real server on-path, or off-path sprays forged Access-Accept packets at the OpenAM client port.

Because the client performs no verification of the response authenticator, no MD5 chosen-prefix forgery is required, which is is materially stronger than the BlastRADIUS family (CVE-2024-3596), in which an attacker must still forge a valid authenticator.

Successful exploitation yields pre-authentication impersonation of any RADIUS-mapped user in any affected realm. The resulting session is indistinguishable from a legitimate RADIUS login and carries the named principal's privileges.

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-radius: < 16.1.1

Scores and how they were measured

CVSS base severity

7.5

Version 3.1As of

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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-386j-6m86-78f9 (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-386j-6m86-78f9, 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: Unauthenticated Authentication Bypass via RADIUS Spoofing (CVE-2026-46560). https://kevwire.com/record/CVE-2026-46560

MLA

"OpenAM: Unauthenticated Authentication Bypass via RADIUS Spoofing (CVE-2026-46560)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-46560.

Chicago

KEVWire. "OpenAM: Unauthenticated Authentication Bypass via RADIUS Spoofing (CVE-2026-46560)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-46560.

Evidence summary (plain text)

OpenAM: Unauthenticated Authentication Bypass via RADIUS Spoofing (Jun 25, 2026).
Description

An Improper Verification of Cryptographic Signature (CWE-347) issue in OpenAM's RADIUS authentication module allows an unauthenticated network attacker to spoof an Access-Accept response and obtain an OpenAM session for any RADIUS username, without knowing the configured shared secret. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.

The RADIUS client opens an unconnected datagram socket and treats the first UDP datagram delivered to its source port as authoritative.
CVSS 7.5 (version 3.1; evidence as of Oct 28, 2026; https://github.com/advisories/GHSA-386j-6m86-78f9).
Sources:
GitHub-reviewed advisory GHSA-386j-6m86-78f9: https://github.com/advisories/GHSA-386j-6m86-78f9
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-46560.
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.

Record JSON

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Record details

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