Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters
CVSS score
9.1
EPSS probability
%0.3
Risk score
0.0
Published
2 mo ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%61
Short explanation
Apache CXF's JwtRequestCodeFilter silently overrides PKCE and nonce parameters in JWT-based authorization flows, allowing clients with valid JWT access to substitute security-sensitive values, undermining PKCE and OpenID Connect protections. Affected versions include 4.2.0 < 4.2.3, 4.0.0 < 4.1.8, and 0 < 3.6.12. Remediation requires upgrading to 4.2.3, 4.1.8, or 3.6.12.
This vulnerability enables attackers to bypass PKCE and perform replay attacks by substituting critical parameters in the authorization flow, compromising authentication integrity and user session security. It affects widely used OpenID Connect implementations in enterprise systems.
What should be done?
- Upgrade to Apache CXF 4.2.3, 4.1.8, or 3.6.12
- Follow vendor advisory for version-specific guidance
- Ensure client_secret is not exposed in JWT claims
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
Apache CXF'nin JwtRequestCodeFilter, bir imzalı istek JWT'den tüm claim'leri, güvenlik hassas parametreleri hariç olmaksızın, yetkili parametre haritasına kopyalar. Bir istemci, geçerli imzalı JWT üretme yetkisine sahipse, PKCE ve nonce değerlerini değiştirerek PKCE bütünlüğünü ve OpenID Connect tekrar korumasını zayıflatabilir.
Bu ele geçirme, Apache CXF 4.2.0'dan 4.2.3'e, 4.0.0'dan 4.1.8'e ve 0'dan 3.6.12'ye kadar olan sürümlerde etkili olup, mevcut kanıtta belirtilen bir düzeltme sürümü yoktur.
Bu ele geçirme, CVE-2026-63687 ve cvelist kaynaklarında açıklanmış ve daha fazla bilgi için Apache e-posta listesi temasına işaret edilmiştir.
Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE: CWE-345
Explanation produced with the local qwen3:4b-instruct model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 9.1 | CVSS V3_1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CVE ADP |
| 9.1 | CVSS V31 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-63687 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-63687 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
9.1 / 10Vulnerability Scoring Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NYama durumu bilinmiyor
Weakness Type (CWE & CAPEC)
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