Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Apache CXF's cxf-rt-rs-security-oauth2 package, versions 4.2.0 up to but not including 4.2.2 and versions below 4.1.7, has a race condition in refresh token processing. When recycleRefreshTokens is set to false, concurrent requests using the same refresh token can each obtain a valid access token, bypassing single-use behavior. An attacker who has obtained a leaked refresh token can exploit this by replaying it concurrently. Upgrade to version 4.2.2 or 4.1.7.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.4 | High | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS 0.0027, the 19th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 12 Jun 2026, 10:16 UTC Confirmed by NVD
- 31 Oct 2026, 14:19 UTC First seen by agentprime
- 31 Oct 2026, 14:19 UTC Confirmed by OSV