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CVE-2026-100227

Apache Cxf: race condition

Risk score
55/100
CVSS
7.5 v3.1
Exploit chance (30 days)
0.3%
Published
9 Oct 2026

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What to know

What it is
Improper Verification of Cryptographic Signature vulnerability in Apache CXF's JAX-RS XML Security module. The JAX-RS XML Signature interceptors (XmlSigInHandler, XmlSigInInterceptor and the streaming XmlSecInInterceptor) did not ensure that the XML passed to the application was covered by the signature. An attacker w…
Affected
Apache Cxf before 4.2.4, 4.1.9, 3.6.13
Fix
Upgrade Apache Cxf to 4.2.4, 4.1.9 or 3.6.13 (whichever matches your release line), or later.
Exploitation
No known exploitation

Story map

Story map: Apache CxfTHE FLAWSTHE FIXCVE-2026-100227Race conditionCVSS 7.5 · EPSS 0%CVE-2026-71575The max_ageauthentication-freshnesscheck in…CVSS 9.1 · EPSS 0%CVE-2026-97468Apache CXF'sSTSTokenValidator andSecurity Token Service (STS)…CVSS 9.1 · EPSS 0%CVE-2026-107938In Apache CXF, theNetty-based HTTP clienttransport…CVSS 9.1 · EPSS 0%Upgrade Apache Cxf4.2.4 · 4.1.9 · 3.6.13or later on your release lineWho is exposedApache Cxf before 4.2.4, 4.1.9,3.6.13AMBER · PATCH THIS WEEKApache CxfThe max_ageauthentication-freshness checkin OidcClientCodeRequestFilterwas inoperative due to amilliseconds/seconds unitmismatch and an invertedcomparison polarity. Any…Where it standsNo known exploitationCONNECTS TOSame weaknessRace condition (CWE-362)94 other warnings in 30 days →Same productEarlier Apache Cxf warnings7 in the last 90 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

Apache Cxf: Amber, patch this week. The max_age authentication-freshness check in OidcClientCodeRequestFilter was inoperative due to a milliseconds/seconds unit mismatch and an inverted comparison polarity. Any relying party using setMaxAgeOffset to enforce re-authentication would silently accept sessions of any age, bypassing step-up authentication pol…

The flaws

  • CVE-2026-100227: Race condition (CVSS 7.5 · EPSS 0%)
  • CVE-2026-71575: The max_age authentication-freshness check in OidcClientCodeRequestFilter was inoperative due to a… (CVSS 9.1 · EPSS 0%)
  • CVE-2026-97468: Apache CXF's STSTokenValidator and Security Token Service (STS) cached validated security tokens… (CVSS 9.1 · EPSS 0%)
  • CVE-2026-107938: In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not… (CVSS 9.1 · EPSS 0%)

The fix

Upgrade Apache Cxf: 4.2.4 · 4.1.9 · 3.6.13 or later on your release line

Who is exposed: Apache Cxf before 4.2.4, 4.1.9, 3.6.13

Where it stands

  • No known exploitation

Connects to

Why it is Yellow

  • CVSS 7.5 high
  • Remotely exploitable without logging in

References

Original description

Improper Verification of Cryptographic Signature vulnerability in Apache CXF's JAX-RS XML Security module. The JAX-RS XML Signature interceptors (XmlSigInHandler, XmlSigInInterceptor and the streaming XmlSecInInterceptor) did not ensure that the XML passed to the application was covered by the signature. An attacker with any document signed by a trusted key could wrap it in unsigned content, which the application would then treat as signed. Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

Last activity 9 Oct 2026. Patch Forecast updates every hour.