CVE-2026-186596.9MediumCWE-863

CVE-2026-18659: Unauthenticated authorization bypass in ConstraintSecurityHandler - HTTP method-omission matched by substring

Eclipse Foundation · org.eclipse.jetty.ee11:jetty-ee11-servlet

Affected: Eclipse Foundation org.eclipse.jetty.ee11:jetty-ee11-servlet · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.4%probability of exploitation in the next 30 days

36th percentile

050100

Higher than 36% of scored CVEs

6.9MediumCVSS 4.0

LowMediumHighCrit.

DescriptionCVE.org

In Eclipse Jetty, across various versions of `jetty-security`, and `jetty-eeN-security`, and `jetty-eeN-servlet`, the Jakarta Spec constraints defined as `http-method-omission` can be bypassed by using substrings of the defined HTTP Methods.

Affected products5

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Eclipse Foundation · org.eclipse.jetty.ee11:jetty-ee11-servletfrom 12.1.0 up to and including 12.1.11
Eclipse Foundation · org.eclipse.jetty.ee10:jetty-ee10-servletfrom 12.1.0 up to and including 12.1.11; from 12.0.0 up to and including 12.0.38
Eclipse Foundation · org.eclipse.jetty.ee9:jetty-ee9-securityfrom 12.1.0 up to and including 12.1.11; from 12.0.0 up to and including 12.0.38
Eclipse Foundation · org.eclipse.jetty.ee8:jetty-ee8-securityfrom 12.1.0 up to and including 12.1.11; from 12.0.0 up to and including 12.0.38
Eclipse Foundation · org.eclipse.jetty:jetty-securityfrom 11.0.0 up to and including 11.0.32; from 10.0.0 up to and including 10.0.32; from 7.6.13 up to and including 9.4.64

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Incorrect Authorization · Access Control
Vendor: Eclipse Foundation
Published: October 2026
Band: Unlikely (under 1%), October 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-18659 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.