CVE-2026-63687: CWE-345 Insufficient Verification of Data Authenticity in Apache Software Foundation Apache CXF
Apache CXF's JwtRequestCodeFilter copies all claims from a signed request JWT into the authorization parameter map without excluding security-sensitive parameters. A client that can produce a validly-signed request JWT (e.g., one whose client_secret is known or compromised) can thereby substitute the code_challenge, code_challenge_method, nonce, and state values that were set in the outer HTTP request, undermining PKCE integrity and OpenID Connect replay protection. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.
AI Analysis
Technical Summary
The vulnerability in Apache CXF's JwtRequestCodeFilter involves insufficient verification of data authenticity (CWE-345). The filter copies all claims from a signed JWT into the authorization parameter map without filtering out security-sensitive parameters. An attacker who can produce a validly-signed JWT (e.g., by knowing or compromising the client_secret) can manipulate parameters such as code_challenge, code_challenge_method, nonce, and state originally set in the HTTP request. This manipulation can undermine the security guarantees of PKCE and OpenID Connect replay protection mechanisms. The issue is addressed by upgrading to Apache CXF versions 4.2.3, 4.1.8, or 3.6.12.
Potential Impact
An attacker with the ability to generate a validly-signed JWT can substitute critical security parameters, potentially bypassing PKCE protections and OpenID Connect replay protections. This could lead to unauthorized authorization flows or replay attacks, weakening the security of authentication processes relying on these mechanisms.
Mitigation Recommendations
Users should upgrade Apache CXF to versions 4.2.3, 4.1.8, or 3.6.12, which contain fixes for this vulnerability. No other mitigations are indicated by the vendor advisory.
CVE-2026-63687: CWE-345 Insufficient Verification of Data Authenticity in Apache Software Foundation Apache CXF
Description
Apache CXF's JwtRequestCodeFilter copies all claims from a signed request JWT into the authorization parameter map without excluding security-sensitive parameters. A client that can produce a validly-signed request JWT (e.g., one whose client_secret is known or compromised) can thereby substitute the code_challenge, code_challenge_method, nonce, and state values that were set in the outer HTTP request, undermining PKCE integrity and OpenID Connect replay protection. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.
Affected software
pkg:maven/Apache Software Foundation/org.apache.cxf:cxf-rt-rs-security-oauth2Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Apache CXF's JwtRequestCodeFilter involves insufficient verification of data authenticity (CWE-345). The filter copies all claims from a signed JWT into the authorization parameter map without filtering out security-sensitive parameters. An attacker who can produce a validly-signed JWT (e.g., by knowing or compromising the client_secret) can manipulate parameters such as code_challenge, code_challenge_method, nonce, and state originally set in the HTTP request. This manipulation can undermine the security guarantees of PKCE and OpenID Connect replay protection mechanisms. The issue is addressed by upgrading to Apache CXF versions 4.2.3, 4.1.8, or 3.6.12.
Potential Impact
An attacker with the ability to generate a validly-signed JWT can substitute critical security parameters, potentially bypassing PKCE protections and OpenID Connect replay protections. This could lead to unauthorized authorization flows or replay attacks, weakening the security of authentication processes relying on these mechanisms.
Mitigation Recommendations
Users should upgrade Apache CXF to versions 4.2.3, 4.1.8, or 3.6.12, which contain fixes for this vulnerability. No other mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-07-17T16:20:23.396Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a74768abf8831d539a9b733
Added to database: 08/06/2026, 11:56:58 UTC
Last enriched: 08/06/2026, 12:16:28 UTC
Last updated: 08/06/2026, 13:04:08 UTC
Views: 4
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