CVE-2026-68079: Apache CXF: DefaultEncryptingCodeDataProvider allows unlimited authorization code replay

[Colm O hEigeartaigh <coheigea () apache org>]

Severity: low 

Affected versions:

- Apache CXF (org.apache.cxf:cxf-rt-rs-security-oauth2) 4.2.0 before 4.2.3
- Apache CXF (org.apache.cxf:cxf-rt-rs-security-oauth2) 4.0.0 before 4.1.8
- Apache CXF (org.apache.cxf:cxf-rt-rs-security-oauth2) before 3.6.12

Description:

In Apache CXF's DefaultEncryptingCodeDataProvider, a captured authorization code can be redeemed an unlimited number of 
times due to a flaw in the implementation of the removeCodeGrant functionality. This violates the RFC requirement that 
"The authorization code MUST NOT be used more than once." Users are recommended to upgrade to versions 4.2.3 or 4.1.8 
or 3.6.12, which fix this issue.

Credit:

Guanping Zhang reported this vulnerability (finder)

References:

https://cxf.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-68079