PatchTheCVECVE-2026-61466: In Apache CXF's OAuth2 Dynamic Client Registration endpoint, the authorization server accepts and stores the `
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CRITICAL 9.1REMOTEWATCHLISTUPGRADE
CVE-2026-61466 is a critical-severity flaw (CVSS 9.1) affecting cxf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.1 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.7% (top 47%) |
| CISA exploited list | No |
| Weakness | CWE-304 |
| Published | 2026-08-06 |
| Last modified | 2026-10-23 |
Publisher (CNA): Apache Software Foundation · Vendor: apache
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
apache cxf UPGRADE
Affected: < 3.6.12 · >= 4.0.0 and < 4.1.8 · >= 4.2.0 and < 4.2.3
Fixed in: 3.6.12, 4.1.8, 4.2.3
Safe to downgrade to: a release before 4.0.0
1. Check installed version
apt-cache policy cxf || rpm -q cxf || cxf --version
2. UPGRADE to 3.6.12 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade cxf
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade cxf
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)
apt-cache madison cxf
sudo apt install cxf=<VERSION_BEFORE_4.0.0>
sudo apt-mark hold cxf
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list cxf
sudo dnf downgrade cxf-<VERSION_BEFORE_4.0.0>
sudo dnf versionlock add cxf
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Exact fixes by distribution
Fedora 46 · pspp · FIXED · 2.1.3-2.fc46 · FEDORA-2026-0d6444911b · source
sudo dnf upgrade --advisory=FEDORA-2026-0d6444911b
Fedora ELN · barman · FIXED · 3.20.1-3.eln159 · FEDORA-2026-45ecf042c2 · source
sudo dnf upgrade --advisory=FEDORA-2026-45ecf042c2
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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