High 7.4Published Jun 12, 2026

CVE-2026-50631Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing

Updated under an hour ago (Oct 27, 2026, 9:10 PM ET)

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It affects Apache Software Foundation Apache CXF and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Apache Software Foundation Apache CXF

Exploited in the last 30 days

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 token can be replayed concurrently by multiple attackers or threads. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.

CVSS: 7.4 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-367
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: apache
NVD analysis: Modified
Record last updated: Aug 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache CXF apache_software_foundation:apache_cxf (from the name)	from 4.2.0 before 4.2.2; from 4.0.0 before 4.1.7; before 3.6.12	CNA record
apache cxf apache:cxf	before 4.1.7; from 4.2.0 before 4.2.2	NVD

References

References

https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/06/11/8	mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.