PatchTheCEVCVE-2026-57817: The OpenID Connect Core 1.0 specification mandates that the RP MUST validate the `c_hash` parameter when opera
51
This month
HIGH 8.1REMOTEWATCHLISTUPGRADE
CVE-2026-57817 is a high-severity flaw (CVSS 8.1) affecting cxf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The OpenID Connect Core 1.0 specification mandates that the RP MUST validate the `c_hash` parameter when operating in the Hybrid Flow. If an Apache CXF RP is integrated with a non-compliant or misconfigured Identity Provider (IdP) that omits the `c_hash`, the RP becomes vulnerable to Authorization Code Substitution/Injection attacks. 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
- High severity
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.1 (High) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.7% (top 48%) |
| CISA exploited list | No |
| Weakness | CWE-20 |
| 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 · python-openslide · FIXED · 1.4.7-1.fc46 · FEDORA-2026-336bea884e · source
sudo dnf upgrade --advisory=FEDORA-2026-336bea884e
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
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.
Related CVEs
- CVE-2026-66909 CRITICAL 9.8 UPGRADE Apache CXF's JMS transport deserializes the body of any inbound JMS ObjectMessage using native Java deserializ
- CVE-2026-68079 CRITICAL 9.8 UPGRADE In Apache CXF's DefaultEncryptingCodeDataProvider, a captured authorization code can be redeemed an unlimited
- CVE-2026-61466 CRITICAL 9.1 UPGRADE In Apache CXF's OAuth2 Dynamic Client Registration endpoint, the authorization server accepts and stores the `
- CVE-2026-54225 HIGH 7.5 UPGRADE Apache CXF allows to control the maximum attachment size via the "attachment-max-size"
- CVE-2026-57819 HIGH 7.5 UPGRADE Apache CXF allows to set a limit on the number of form parameters in a JAX-RS message via the "maxFormParamete