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CVE-2026-50632 – Remote Code Execution (RCE) – Apache CXF (versions prior to 4.1.7 / 4.2.2)

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Summary

CVE-2026-50632 is a critical remote code execution (RCE) vulnerability in Apache CXF, assigned a CVSS v3.1 base score of 9.8. It is the third generation in an incomplete-fix chain — following CVE-2025-48913 and CVE-2026-44417 — stemming from a JNDI injection flaw in the framework’s JMS configuration handling that prior patches failed to fully remediate. Exploitation requires no authentication and no user interaction, and can result in complete server compromise.

Technical details

  • Root cause: Improper input validation (CWE-20) in Apache CXF’s JMS configuration component (JMSConfigFactory). The vulnerability is classified as a JNDI injection flaw: each patch in the chain (CVE-2025-48913 → CVE-2026-44417 → CVE-2026-50632) left residual code paths through which malicious JNDI URLs — using RMI or LDAP schemes — could still be supplied and processed by the server.
  • Trigger condition: Exploitation is possible when untrusted users are permitted to supply or modify JMS configuration parameters for an Apache CXF deployment.
  • Attack vector: Network-accessible with no authentication and no user interaction required (AV:N/AC:L/PR:N/UI:N). An attacker delivers a crafted JMS configuration containing a malicious JNDI URL, causing the server to make an outbound RMI or LDAP lookup that loads and executes attacker-controlled code.
  • Impact: Full remote code execution — complete compromise of the confidentiality, integrity, and availability of the affected host (C:H/I:H/A:H).

Affected software

  • Apache CXF 4.2.0 through 4.2.1 (all versions prior to 4.2.2)
  • Apache CXF 4.1.0 through 4.1.6 (all versions prior to 4.1.7)

Severity

CVSS v3.1 base score: 9.8 (Critical)
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade to Apache CXF 4.2.2 or 4.1.7, which contain the definitive fix for this vulnerability as confirmed by the Apache Software Foundation.
  • If immediate patching is not feasible: Restrict application-level authorization so that untrusted users cannot supply or modify JMS configuration parameters for Apache CXF. Limiting network access to JMS configuration endpoints provides additional defense-in-depth.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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