Authorization-code replay via concurrent code redemption
Published Aug 6, 2026 · Updated Aug 6, 2026
Authorization-code replay in Apache CXF before 3.6.12, 4.0.0 through 4.1.7, and 4.2.0 through 4.2.2 allows remote attackers to obtain valid tokens. JCacheCodeDataProvider checks a cached authorization code and removes its grant in separate, non-atomic operations, so concurrent exchanges can each pass the one-time-use check. Exploitation requires a valid authorization code and parallel requests to an application that deploys this JCache-backed OAuth2 provider; each successful exchange returns a distinct bearer token with the code's granted access.
Summary
What happened
Authorization-code replay in Apache CXF before 3.6.12, 4.0.0 through 4.1.7, and 4.2.0 through 4.2.2 allows remote attackers to obtain valid tokens. JCacheCodeDataProvider checks a cached authorization code and removes its grant in separate, non-atomic operations, so concurrent exchanges can each pass the one-time-use check. Exploitation requires a valid authorization code and parallel requests to an application that deploys this JCache-backed OAuth2 provider; each successful exchange returns a distinct bearer token with the code's granted access.
The record
- CVE
- CVE-2026-57818
- Published
- Aug 6, 2026
- Updated
- Aug 6, 2026
- Vendor
- The Apache Software Foundation
- Product
- Apache CXF
- Classifications
- CWE-367, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 6, 2026CVE publishedPublication date reported by the CVE source.
- Aug 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.6.12
- Affected versionversion=4.0.0 <4.1.8
- Affected versionversion=4.2.0 <4.2.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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