CVE-2026-50631
High
Description
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.
SeverityHigh
CVSS7.4
Exploit probability—
Product
Apache Cxf
PublishedJun 12, 2026
First seenJun 12, 2026
Weakness typeCWE-367CWE-367
How to fix
Update
- apache cxf4.1.7, 4.2.2, 3.6.12 or later
- org.apache.cxf:cxf-rt-rs-security-oauth24.2.2, 4.1.7 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apache cxf | v < 4.1.7, 4.2.0 ≤ v < 4.2.2, v < 3.6.12, 4.0.0 ≤ v < 4.1.7 | 4.1.7, 4.2.2, 3.6.12 |
| org.apache.cxf:cxf-rt-rs-security-oauth2Maven | 4.2.0 ≤ v < 4.2.2, v < 4.1.7 | 4.2.2, 4.1.7 |
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