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CVE-2026-9561 Eclipse Foundation CVE debrief

CVE-2026-9561 is a high-severity vulnerability in Eclipse Kura versions prior to 5.6.2. The vulnerability allows unauthenticated remote attackers to bypass IP-based brute-force protections by spoofing the logged IP address. This is achieved by exploiting the trust in the client-supplied X-Forwarded-For HTTP header as the authoritative source of the client IP address in audit log entries. The affected product is Eclipse Kura, and the vulnerability class is related to IP address spoofing. The likely operational impact is a bypass of IP-based brute-force protections, and the source-confidence limits are based on the CVE record and NVD entry.

Vendor
Eclipse Foundation
Product
Eclipse Kura
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-08-18
Advisory published
2026-07-14
Advisory updated
2026-08-18

Who should care

Users of Eclipse Kura versions prior to 5.6.2 should be aware of this vulnerability and take necessary actions to mitigate it. This includes updating to version 5.6.2 or later and implementing additional security measures to prevent IP address spoofing. Affected operators, platforms, vulnerability-management teams, and security teams should review the vulnerability and take action to protect their systems.

Technical summary

The org.eclipse.kura.web2 (Web Console) and org.eclipse.kura.rest.provider (REST API) components use the X-Forwarded-For header as the primary IP source when initializing audit context. The org.eclipse.kura.jetty.customizer unconditionally installs Jetty's ForwardedRequestCustomizer on all HTTP/HTTPS connectors, causing HttpServletRequest.getRemoteAddr() to reflect the attacker-controlled header value. This allows an unauthenticated remote attacker to bypass IP-based brute-force protections, such as fail2ban, by spoofing the logged IP address to a non-routable value.

Defensive priority

High

Recommended defensive actions

  • Update Eclipse Kura to version 5.6.2 or later
  • Implement additional security measures to prevent IP address spoofing
  • Monitor for suspicious activity and implement logging and auditing mechanisms
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-14T09:16:42.180Z and has not been modified since then. The NVD entry is currently in the 'Received' status. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The Eclipse Kura project has not provided additional details beyond the CVE record.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9561 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9561

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-9561 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9561

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.