What is CVE-2026-50631?

CVE-2026-50631 is a high-severity vulnerability in Apache Cxf, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.4/10. Published 2026-06-12.

How severe is CVE-2026-50631?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Apache Cxf

CVE-2026-50631

A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh t…

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

EPSS: 0.003 (21.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Apache Cxf
Apache Software Foundation Cxf — versions 4.2.0, 0

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

security@apache.org (vendor-advisory, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-50631?: CVE-2026-50631 is a high-severity vulnerability in Apache Cxf, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.4/10. Published 2026-06-12.
How severe is CVE-2026-50631?: High severity. CVSS v3 base score is 7.4 out of 10.