High severity · published Aug 6, 2026
CVE-2026-57818
Apache CXF: OAuth2 Authorization Code Replay via TOCTOU in JCacheCodeDataProvider
8.1
CVSS
0.5%
EPSS
No
On KEV
Description
A race condition in JCacheCodeDataProvider allows an attacker to redeem a single authorization code multiple times via concurrent requests, resulting in the issuance of multiple distinct, valid access tokens. Users are recommended to upgrade to versions 4.2.3, 4.1.8 or 3.6.12, which fix this issue.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
Apache CXF · Apache Software Foundation
4.2.0 before 4.2.3; 4.0.0 before 4.1.8; before 3.6.12 · source: vendor
CX
Cxf · Apache
before 3.6.12; 4.0.0 before 4.1.8; 4.2.0 before 4.2.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57818
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57818
Mailing List
https://lists.apache.org/thread/7q08mz8bcbosp25wok7gr537zlp15mfz
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/08/06/20
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