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 before 4.1.7, has an authentication bypass in the OAuth2 TokenIntrospectionService. An unauthenticated attacker with network access can reach the introspection endpoint, though the source notes this only matters when authentication was not enabled on the service. 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 |
|---|---|---|---|---|
| 6.5 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS 0.0037, the 31st 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