Medium severity · published Jun 12, 2026
CVE-2026-50634
Apache CXF: WS JSON request filter trusts metadata from an unvalidated first signature entry
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
A vulnerability in Apache CXF's JwsJsonContainerRequestFilter can be exploited to cause CXF to process metadata that was not authenticated by the accepted signature. This can bypass the application's assumption
that accepted `Content-Type` or protected HTTP-header metadata came from a verified signature entry, and may steer downstream JAX-RS entity parsing or signed-header consistency checks. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fix this issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
Apache CXF · Apache Software Foundation
4.2.0 before 4.2.2; 4.0.0 before 4.1.7; before 3.6.12 · source: vendor
CX
Cxf · Apache
before 4.1.7; 4.2.0 before 4.2.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50634
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-50634
Mailing List
https://lists.apache.org/thread/9nfwh9d3m4kznxrk1mz98hl0jml18k0p
Mailing List
http://www.openwall.com/lists/oss-security/2026/06/11/11
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