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VulnerabilityPublished

CVE-2026-65583: Apache CXF · Insufficient Verification of Data Authenticity

Affects Apache CXFSource CVE Database V5

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Not known to be exploited · CVSS 9.1 Critical · fixed in 4.2.3 : patch Apache CXF as a priority.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 20% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.2.3, 4.1.8, 3.6.12
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade Apache to 4.2.3, 4.1.8 or 3.6.12.

Affected software

ProductAffectedFixed in
Apache Software FoundationApache CXFAffected
  • >=4.2.0 <4.2.3
Fixed in
  • 4.2.3
Apache Software FoundationApache CXFAffected
  • >=4.0.0 <4.1.8
Fixed in
  • 4.1.8
Apache Software FoundationApache CXFAffected
  • <3.6.12
Fixed in
  • 3.6.12
MavenApache Software Foundation/org.apache.cxf:cxf-rt-rs-security-sso-oidcpkg:maven/Apache Software Foundation/org.apache.cxf:cxf-rt-rs-security-sso-oidcOther threatsAffected
  • >=4.2.0 <4.2.3
  • >=4.0.0 <4.1.8
  • <3.6.12
Fixed in
  • 4.2.3
  • 4.1.8
  • 3.6.12

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade Apache CXF to versions 4.2.3, 4.1.8, or 3.6.12 where this vulnerability is fixed. Since self-issued ID tokens are not accepted by default, users who do not enable this feature are less exposed. No other mitigations are specified. Patch status is not explicitly stated but the recommended versions indicate an official fix is available.

Description

Apache CXF versions prior to 4.2.3, 4.1.8, and 3.6.12 contain a vulnerability in the OIDC relying-party token validation process. This flaw allows acceptance of self-issued ID tokens without enforcing critical claim checks such as issuer, subject, audience, time, and sub_jwk binding, potentially enabling authentication bypass with crafted tokens. By default, self-issued ID tokens are not accepted, mitigating some risk. Upgrading to versions 4.2.3, 4.1.8, or 3.6.12 addresses this issue.

References

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