CVE-2026-61466
OAuth2 client registration allows self-assigned privileged scopes in Apache CXF
Is CVE-2026-61466 being exploited?
Not confirmed. CVE-2026-61466 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.42% probability of exploitation in the next 30 days.
How severe is CVE-2026-61466?
CVE-2026-61466 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-61466?
Yes. A fix has been recorded for CVE-2026-61466. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-61466 affect?
CVE-2026-61466 affects Apache CXF OAuth2 Dynamic Client Registration endpoint, Apache CXF < 4.2.3, Apache CXF < 4.1.8, Apache CXF < 3.6.12, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-61466?
Upgrade to 4.2.3 / 4.1.8 / 3.6.12 and enforce server-side scope allowlists
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Clients can register and obtain elevated privileged scopes, enabling unauthorized access and privilege escalation in OAuth2-protected services.
Patch when possible
- affected< 3.6.12
- affected>= 4.0.0 and < 4.1.8
- affected>= 4.2.0 and < 4.2.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.