CVE-2026-9561: Eclipse Kura versions prior to 5.6.2 trust the client-supplied X-Forwarded-For HTTP header as the authoritativ

This week

HIGH 8.2REMOTEUPGRADE

CVE-2026-9561 is a high-severity flaw (CVSS 8.2) affecting kura. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Eclipse Kura versions prior to 5.6.2 trust the client-supplied X-Forwarded-For HTTP header as the authoritative source of the client IP address in audit log entries. The org.eclipse.kura.web2 (Web Console) and org.eclipse.kura.rest.provider (REST API) components use this header as the primary IP source when initializing audit context, and org.eclipse.kura.jetty.customizer unconditionally installs Jetty's ForwardedRequestCustomizer on all HTTP/HTT

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-345, CWE-348, CWE-807
Published	2026-07-14
Last modified	2026-10-24

Publisher (CNA): Eclipse Foundation · Vendor: eclipse

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 09:16 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

eclipse kura UPGRADE

Affected: >= 5.0.0 and < 5.6.2

Fixed in: 5.6.2

Safe to downgrade to: a release before 5.0.0

1. Check installed version

apt-cache policy kura || rpm -q kura || kura --version

2. UPGRADE to 5.6.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kura

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kura

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 5.0.0 (Debian / Ubuntu)

apt-cache madison kura sudo apt install kura=<VERSION_BEFORE_5.0.0> sudo apt-mark hold kura

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list kura sudo dnf downgrade kura-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add kura

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.

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.

Quick answers

How do I fix CVE-2026-9561?

kura: upgrade to 5.6.2. Exact commands for each OS are on this page.

Is CVE-2026-9561 being exploited?

CVE-2026-9561 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-9561 affect?

CVE-2026-9561 affects kura. Severity is high (CVSS 8.2). Eclipse Kura versions prior to 5.6.2 trust the client-supplied X-Forwarded-For HTTP header as the authoritative source of the client IP address in audit log entries. The org.eclipse.kura.web2 (Web Console) and org.eclipse.kura.rest.provider

How urgent is CVE-2026-9561?

Priority 44/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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