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CVE-2026-105115 – Unauthenticated Arbitrary Class Instantiation / Potential RCE – OpenAM ≤ 16.1.2

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Summary

CVE-2026-105115 is a missing authentication vulnerability in OpenAM’s legacy JAX-RPC SOAP interface (/jaxrpc/*) that allows an unauthenticated, network-based attacker to load and instantiate arbitrary Java classes available on the server’s classpath. The flaw affects all OpenAM versions through 16.1.2 and carries a High/Critical severity rating given its unauthenticated, network-exploitable nature and potential for server crashes, classpath enumeration, or code execution.

Technical details

  • Root cause: the legacy JAX-RPC SOAP endpoint takes a Java class name directly from the incoming request and loads/instantiates it before verifying that it is of the expected type (CWE-470, Unsafe Reflection with External Input).
  • Compounding issue: the operation performs inadequate session validation, accepting session identifiers without actually verifying them (CWE-306, Missing Authentication for Critical Function).
  • Trigger conditions: an attacker sends a crafted SOAP request to an exposed /jaxrpc/* endpoint, supplying an arbitrary class name and an unverified session identifier — no authentication or prior access is required.
  • Attack vector: network-based, no privileges or user interaction needed.
  • Impact: confirmed impacts include denial of service (server crashes) and classpath/class enumeration; the advisory states the theoretical ceiling is remote code execution via gadget chains, though RCE has not been publicly demonstrated.

Affected software

  • OpenIdentityPlatform OpenAM versions ≤ 16.1.2 (all versions prior to 16.1.3)

Severity

  • CVSS v3.1 Base Score: 8.6 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
  • A CVSS v4.0 score of 8.8 (High) has also been published for this CVE.

Mitigation and recommended actions

  • Immediate: Upgrade to OpenAM 16.1.3 or later, which contains the fix for this issue.
  • If immediate patching is not possible: Restrict network access to the /jaxrpc/* path at the firewall or reverse-proxy level; if legacy remote SDK clients that depend on the JAX-RPC interface are not in use, block access to this path entirely.

References

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