CVE-2026-50631
Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
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, which fixes this issue.
INFO
Published Date :
June 12, 2026, 10:16 a.m.
Last Modified :
June 12, 2026, 10:16 a.m.
Remotely Exploit :
No
Source :
[email protected]
Solution
- Upgrade to version 4.2.2 or 4.1.7.
- Apply vendor-provided security patches.
- Limit refresh token reuse.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-50631.
| URL | Resource |
|---|---|
| https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8 | |
| http://www.openwall.com/lists/oss-security/2026/06/11/8 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-50631 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-50631
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-50631 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-50631 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Jun. 12, 2026
Action Type Old Value New Value Added 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, which fixes this issue. Added CWE CWE-367 Added Reference https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Jun. 12, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/06/11/8