A race condition in JCacheCodeDataProvider allows an attacker to redeem a single authorization code multiple times via concurrent requests, resulting...
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
AI Analyst Comment
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
---METADATA---
VENDOR: Apache
PRODUCT: Apache CXF
AFFECTED_VERSIONS: 4.2.0 up to (excluding) 4.2.3, 4.0.0 up to (excluding) 4.1.8, 0 up to (excluding) 3.6.12
CONFIDENCE: high
MISSING: patch
---END_METADATA---
Description Summary:
A race condition in Apache CXF's JCacheCodeDataProvider allows for the repeated redemption of authorization codes, resulting in the issuance of multiple valid access tokens.
Executive Summary:
A race condition vulnerability in Apache CXF allows unauthenticated attackers to bypass authorization controls, potentially leading to unauthorized token generation and session hijacking.
Vulnerability Details
CVE-ID: CVE-2026-57818
Affected Software: Apache CXF
Affected Versions: See metadata for affected version ranges.
Vulnerability: This is a Time-of-check Time-of-use (TOCTOU) race condition (CWE-367) found in the JCacheCodeDataProvider. The vulnerability is exploitable by an unauthenticated remote attacker who can send concurrent requests to redeem authorization codes multiple times.
Business Impact
Successful exploitation allows an attacker to generate multiple valid access tokens from a single authorization code, effectively bypassing authentication and authorization mechanisms. With a CVSS score of 8.1, this flaw poses a severe risk to service integrity and user account security, potentially leading to widespread unauthorized access to protected resources.
Remediation Plan
Immediate Action: Update to the latest version of Apache CXF as defined in the vendor security advisory to resolve the race condition.
Proactive Monitoring: Monitor authentication logs for suspicious patterns of multiple access token requests occurring in rapid succession for the same user or authorization code.
Compensating Controls: Deploy a Web Application Firewall (WAF) to throttle or block rapid, concurrent requests to the authorization endpoint, which may mitigate the race condition during the patching window.
Exploitation Status
Public Exploit Available: Unknown
Analyst Notes: As of August 6, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. The nature of this race condition requires precise timing, making it inherently more difficult to exploit than standard injection flaws.
Analyst Recommendation
The ability to generate unauthorized access tokens is a critical security failure for any application relying on Apache CXF for OAuth or similar flows. Security teams must ensure that the application is updated to the fixed version immediately to restore the integrity of the authorization process.