CVE-2026-61466

Q: Is CVE-2026-61466 being actively exploited?

Not that we know of. CVE-2026-61466 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.44% is the estimated probability that it will be exploited in the next 30 days. That is higher than 36% of all scored CVEs.

Q: How severe is CVE-2026-61466?

CVE-2026-61466 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-61466 affect?

Published advisories record a fix for cxf (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICAL

9.1

CVSS v3

NVD

Description

In Apache CXF's OAuth2 Dynamic Client Registration endpoint, the authorization server accepts and stores the `scope` value supplied in the client registration request verbatim, without validating it against an AS-defined allowlist. This could lead to a client self-assigning privileged scopes at registration time. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.

CWE-304

How to fix

Remediation Available

cxfNVD

Affected:>= 4.0.0, < 4.1.8Fixed in:4.1.8CVE-2026-61466derived from NVD

Affected:< 3.6.12Fixed in:3.6.12CVE-2026-61466derived from NVD

Affected:>= 4.2.0, < 4.2.3Fixed in:4.2.3CVE-2026-61466derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Exploit Intelligence

0.44%probability of exploitation in 30 days

36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Vendor Advisory1

lists.apache.org

Other references1

openwall.com

Related Vulnerabilities

Other CWE-304 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2026-55957	High	7.3	2.9%	-	Fix
CVE-2022-1065	High	8.1	2.8%	-	Fix
CVE-2022-2302	Critical	9.8	1.9%	-	Fix
CVE-2024-2172	Critical	9.8	1.7%	-	-
CVE-2019-16766	High	8.7	1.5%	-	Fix
CVE-2021-41179	Medium	6.5	1.2%	-	Fix

Common questions

How do I fix CVE-2026-61466?

Upgrade cxf to 4.1.8 or later.

Is CVE-2026-61466 being actively exploited?

Not that we know of. CVE-2026-61466 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.44% is the estimated probability that it will be exploited in the next 30 days. That is higher than 36% of all scored CVEs.

How severe is CVE-2026-61466?

CVE-2026-61466 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-61466 affect?

Published advisories record a fix for cxf (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-07.