November 13, 2026

CVE Watchtower

CVE-2026-97791Apache Cxf Race Condition

NVDCVSS scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0

Vulnerability Summary

In Apache CXF, STSTokenValidator checks whether a SAML assertion is signed by a trusted certificate before deciding to send it to the STS. That result was stored in one object shared by all requests, so one request could read another's result. A remote, unauthenticated attacker could send a forged assertion signed with an untrusted certificate while legitimate requests were being processed, and it could be accepted as trusted without ever reaching the STS. Only services that use STSTokenValidator to validate SAML tokens without alwaysValidateToSts set are affected.Β 
Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.
Severity Level
HIGH(7.5)
Published Date
Oct 9, 2026
Last Modified
Oct 20, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.31%Probability
Root Weakness (CWE)
CWE-362: Race Condition β†—
The product contains a concurrent code sequence that requires exclusive access to a shared resource, but a timing window exists in which another code sequence can modify the resource.
CVSS v3.1 Base Metrics — Score 7.5 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Apache Cxf < 3.6.13
  • Apache Cxf >= 4.0.0 and < 4.1.9
  • Apache Cxf >= 4.2.0 and < 4.2.4
Patched Versions
  • Apache Cxf 3.6.13
  • Apache Cxf 4.1.9
  • Apache Cxf 4.2.4

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is high.

  1. Check whether you run Apache Cxf and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Oct 9, 2026Published
  • Oct 20, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 13, 2026 21:28 UTC