Improper Verification of Cryptographic Signature in Apache CXF
CVE-2026-100227

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Cxf
Vendor
CVE Published:
9 October 2026

What is CVE-2026-100227?

A vulnerability exists within Apache CXF's JAX-RS XML Security module that fails to properly verify cryptographic signatures. Specifically, the XML Signature interceptors such as XmlSigInHandler, XmlSigInInterceptor, and streaming XmlSecInInterceptor do not ensure that the incoming XML data is appropriately signed. As a result, an attacker can manipulate signed documents, allowing unsigned content to be processed as though it were validly signed. To mitigate this risk, it is crucial for users to upgrade to supported versions, specifically 4.2.4, 4.1.9, or 3.6.13, where this issue has been rectified.

Affected Version(s)

Apache CXF 4.2.0 < 4.2.4

Apache CXF 4.0.0 < 4.1.9

Apache CXF 0 < 3.6.13

References

https://lists.apache.org/thread.html/pst2oopnwt2rwhvkvmt5...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was found using Claude agents to study the security of open-source projects and independently by Guanping Zhang
.