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 is affected in versions from 4.2.0 before 4.2.2 and before 4.1.7. The OAuth2 AuthorizationUtils class does not strip carriage return and line feed characters from the realm value when building the WWW-Authenticate header, so an attacker who can control that realm value can inject arbitrary HTTP headers or split the response. 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