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CVE-2026-63687

Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters

Published: Aug 6, 2026Updated: Aug 7, 2026 Sources: CVE List NVDCWE-345
9.1CRITICAL
NVD MITRE
EPSS Score
0.3%
Top 81.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-345

Affected Products

apache
oss-project·USaka apache http server, apache httpd
cxfLibraryLibrary
OSS Libraries / generic-library
Apache Software Foundation
oss-project·USaka apache foundation
Apache CXFLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

https://lists.apache.org/thread/drcq4chmt0btx86f17o47j17r378hzpw
lists.apache.org
http://www.openwall.com/lists/oss-security/2026/08/06/22
openwall.com

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