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Critical severity · published Aug 6, 2026
CVE-2026-65583
Apache CXF: Self-issued ID token claims validation skipped
9.1
CVSS
0.3%
EPSS
No
On KEV
Description
Apache CXF’s OIDC relying-party token validation could accept self-issued ID tokens without enforcing required claim checks (issuer/subject/audience/time and sub_jwk binding), enabling authentication bypass with crafted tokens. However, note that self-issued ID tokens are not accepted by default in the validator. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fixes this issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
Apache CXF · Apache Software Foundation
4.2.0 before 4.2.3; 4.0.0 before 4.1.8; before 3.6.12 · source: vendor
CX
Cxf · Apache
before 3.6.12; 4.0.0 before 4.1.8; 4.2.0 before 4.2.3 · source: NVD
Affected product
AC
Apache CXF
Apache Software Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-65583
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-65583
Mailing List
https://lists.apache.org/thread/fzj8yzgfl53gclxrcdrnrx3grcpkq51j
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/08/06/23
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