CVE-2026-63687— Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters
Quick assessment
Affected
Apache Software Foundation Apache CXF
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Apache CXF 的 JwtRequestCodeFilter 会将已签名请求 JWT 中的所有声明（claims）复制到授权参数映射中，而未排除安全性敏感参数。攻击者若能生成有效签名的请求 JWT（例如，已知或泄露了 client_secret），则可替换外层 HTTP 请求中设置的 code_challenge、code_challenge_method、nonce 和 state 值，从而破坏 PKCE（Proof Key for Code Exchange）的完整性以及 OpenID Connect 的
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache CXF | 4.2.0< 4.2.3 |
affected |
4.0.0< 4.1.8 |
affected | ||
< 3.6.12 |
affected |
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I. Basic Information for CVE-2026-63687
Vulnerability Information
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Vulnerability Title
Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache CXF | 4.2.0 ~ 4.2.3 | - |
|
II. Public POCs for CVE-2026-63687
| # | POC Description | Source Link | Shenlong Link |
|---|
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Mailing List Discussions for CVE-2026-63687 (1)
Same Patch Batch · Apache Software Foundation · 2026-08-06 · 18 CVEs total
| CVE-2026-64640 | 5.3 MEDIUM | Apache Polaris: register endpoint reads attacker-controlled storage location before allowe |
| CVE-2026-68079 | Apache CXF: DefaultEncryptingCodeDataProvider allows unlimited authorization code replay | |
| CVE-2026-54225 | Apache CXF: Denial of Service attack via large attachments | |
| CVE-2026-57819 | Apache CXF: No default restriction on the amount of form parameters per message | |
| CVE-2026-64958 | Apache CXF: Denial of service via message header attachments | |
| CVE-2026-66909 | Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage | |
| CVE-2026-57817 | Apache CXF: The authorization code hash (c_hash) is not enforced for the hybrid OIDC flow | |
| CVE-2026-65432 | Apache CXF: XXE via WSDL/XSD import parsing | |
| CVE-2026-68481 | Apache CXF: Revocation bypass in DefaultEncryptingOAuthDataProvider | |
| CVE-2025-49506 | Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack | |
| CVE-2026-65583 | Apache CXF: Self-issued ID token claims validation skipped | |
| CVE-2026-61466 | Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation | |
| CVE-2026-57818 | Apache CXF: OAuth2 Authorization Code Replay via TOCTOU in JCacheCodeDataProvider | |
| CVE-2026-34502 | Apache Portable Runtime Utility: Heap buffer overflow in APR memcached client | |
| CVE-2026-34501 | Apache Portable Runtime Utility: Heap buffer overflow in APR redis client | |
| CVE-2026-34191 | Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle | |
| CVE-2026-32327 | Apache Portable Runtime Utility: apr-util XML stack recursion crash |
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