CVE-2026-63687Apache CXF: JwtRequestCodeFilter silently overrides outer PKCE and nonce parameters
Updated under an hour ago ()
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It affects Apache Software Foundation Apache CXF and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 9.1 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-345
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- apache
- NVD analysis
- Modified
- Record last updated
- Aug 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apache Software Foundation Apache CXF apache_software_foundation:apache_cxf (from the name) | from 4.2.0 before 4.2.3; from 4.0.0 before 4.1.8; before 3.6.12 | CNA record |
apache cxf apache:cxf | before 3.6.12; from 4.0.0 before 4.1.8; from 4.2.0 before 4.2.3 | NVD |
References
- https://lists.apache.org/thread/drcq4chmt0btx86f17o47j17r378hzpwvendor-advisory, mailing-list
- http://www.openwall.com/lists/oss-security/2026/08/06/22
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.