Apache CXF up to 3.6.12/4.1.8/4.2.3 JAX-RS XML Signature Interceptors data authenticity

Summaryinfo

A vulnerability, which was classified as critical, was found in Apache CXF up to 3.6.12/4.1.8/4.2.3. This affects the function XmlSigInHandler/XmlSigInInterceptor/XmlSecInInterceptor of the component JAX-RS XML Signature Interceptors. The manipulation results in data authenticity. This vulnerability is known as CVE-2026-100227. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Apache CXF up to 3.6.12/4.1.8/4.2.3. Affected is the function XmlSigInHandler/XmlSigInInterceptor/XmlSecInInterceptor of the component JAX-RS XML Signature Interceptors. The manipulation with an unknown input leads to a data authenticity vulnerability. CWE is classifying the issue as CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Improper Verification of Cryptographic Signature vulnerability in Apache CXF's JAX-RS XML Security module. The JAX-RS XML Signature interceptors (XmlSigInHandler, XmlSigInInterceptor and the streaming XmlSecInInterceptor) did not ensure that the XML passed to the application was covered by the signature. An attacker with any document signed by a trusted key could wrap it in unsigned content, which the application would then treat as signed. Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

The advisory is available at lists.apache.org. This vulnerability is traded as CVE-2026-100227 since 09/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/09/2026).

Upgrading to version 3.6.13, 4.1.9 or 4.2.4 eliminates this vulnerability.

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Productinfo

Type

• Application Server Software

Vendor

• Apache

Name

• CXF

Version

• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3
• 3.6.4
• 3.6.5
• 3.6.6
• 3.6.7
• 3.6.8
• 3.6.9
• 3.6.10
• 3.6.11
• 3.6.12
• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6
• 4.1.7
• 4.1.8
• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3

License

• open-source

Website

• Vendor: https://www.apache.org/

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