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CVE-2026-63687

Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters

9.1 Critical

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

0.28%Unchanged since Aug 7, 2026
90%50%10%1%

What each source reports

CVE List Score used 9.1

Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters

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.

Record
CVE-2026-63687
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-345
Updated
2026-11-02
EUVDEUVD-2026-53860 9.1

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.

Record
EUVD-2026-53860
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-7hjx-472h-3f7q 9.1

Apache CXF's JwtRequestCodeFilter copies all claims from a signed request JWT into the...

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.

Record
GHSA-7hjx-472h-3f7q
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-345
Updated
2026-11-02
NVD 9.1

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.

Record
CVE-2026-63687
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-345
Updated
2026-11-02
OSV 9.1

Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters

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.

Record
CVE-2026-63687
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-345
Updated
2026-11-02
OSVRHLW-2026-2d8697b26ccd16c3 8.1

Lightwell Security Advisory: cxf-rt-rs-security-oauth2 4.2.2.rhlw-00006

Red Hat Lightwell has released org.apache.cxf:cxf-rt-rs-security-oauth2 4.2.2.rhlw-00006 with backported fixes for CVE-2026-57818, CVE-2026-63687, CVE-2026-68079, and CVE-2026-68481.

CVE-2026-57818: Apache CXF: OAuth2 Authorization Code Replay via TOCTOU in JCacheCodeDataProvider

CVE-2026-63687: Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters

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

CVE-2026-68481: Apache CXF: Revocation bypass in DefaultEncryptingOAuthDataProvider

This patched artifact is a drop-in replacement for org.apache.cxf:cxf-rt-rs-security-oauth2 4.2.2 from Maven Central.

Record
RHLW-2026-2d8697b26ccd16c3
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHLW-2026-fd244c7ea4e4e9e4 4.8

Lightwell Security Advisory: cxf-rt-rs-security-oauth2 3.6.9.rhlw-00003

Red Hat Lightwell has released org.apache.cxf:cxf-rt-rs-security-oauth2 3.6.9.rhlw-00003 with backported fixes for CVE-2026-50623, CVE-2026-50627, CVE-2026-50628, CVE-2026-50629, CVE-2026-50630, CVE-2026-50631, CVE-2026-57818, CVE-2026-61466, CVE-2026-63687, CVE-2026-68079, and CVE-2026-68481.

CVE-2026-50623: Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService

CVE-2026-50627: Apache CXF: OAuth2: Missing JWT Audience and Issuer Validation in Access Token Validator

CVE-2026-50628: Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control

CVE-2026-50629: Apache CXF: OAuth2: Log Injection via Unsanitized Client Identifier

CVE-2026-50630: Apache CXF: OAuth2: HTTP Response Splitting via WWW-Authenticate Realm Injection

CVE-2026-50631: Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing

CVE-2026-57818: Apache CXF: OAuth2 Authorization Code Replay via TOCTOU in JCacheCodeDataProvider

CVE-2026-61466: Apache CXF: OAuth2 Dynamic Client Registration Scope Self-Escalation

CVE-2026-63687: Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters

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

CVE-2026-68481: Apache CXF: Revocation bypass in DefaultEncryptingOAuthDataProvider

This patched artifact is a drop-in replacement for org.apache.cxf:cxf-rt-rs-security-oauth2 3.6.9 from Maven Central.

Record
RHLW-2026-fd244c7ea4e4e9e4
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
org.apache.cxf:cxf-rt-rs-security-oauth2
Red Hat Lightwell:Maven
From an advisory covering 4 CVEs
 4.2.2 up to 4.2.2.rhlw-00006
4.2.2.rhlw-00006
org.apache.cxf:cxf-rt-rs-security-oauth2
Red Hat Lightwell:Maven
From an advisory covering 11 CVEs
 before 3.6.9.rhlw-00003, plus listed versions
2.6.02.6.12.6.102.6.112.6.12
Show 45 moreShow less
2.6.132.6.142.6.152.6.162.6.172.6.22.6.32.6.42.6.52.6.62.6.72.6.82.6.92.7.02.7.12.7.102.7.112.7.122.7.132.7.142.7.152.7.162.7.172.7.182.7.22.7.32.7.42.7.52.7.62.7.72.7.82.7.93.0.03.0.0-milestone13.0.0-milestone23.0.13.0.103.0.113.0.123.0.133.0.143.0.153.0.163.0.23.0.3
3.6.9.rhlw-00003

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-63687 is a critical vulnerability (CVSS 9.1) in Apache Cxf, published August 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. No source names a fixed version.

References

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