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Fencer Vulns
medium 6.9

CVE-2026-18659 json

Unauthenticated authorization bypass in ConstraintSecurityHandler - HTTP method-omission matched by substring

published 2026-10-15 25 d ago modified 2026-10-15 25 d ago also EUVD-2026-101996

cvss
6.9
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

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.

Patch / fix

  • org.eclipse.jetty.ee11 jetty-ee11-servlet 12.1.12
  • org.eclipse.jetty.ee10 jetty-ee10-servlet 12.0.39, 12.1.12
  • org.eclipse.jetty.ee9 jetty-ee9-security 12.0.39, 12.1.12
  • org.eclipse.jetty.ee8 jetty-ee8-security 12.0.39, 12.1.12
  • org.eclipse.jetty jetty-security 9.4.65, 10.0.33, 11.0.33
  • jetty12 Debian 14 12.0.39-1

debian advisories DEBIAN-CVE-2026-18659

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-18659 updated cvss 6.5

org.eclipse.jetty/jetty-security: Eclipse Jetty: Security constraint bypass via HTTP method substrings

  • Red Hat Exploit Intelligence exploit-intelligence/agent-client-rhel9 Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, jenkins 2.516.3.1758206866-3.el9
    affected: workaround, no fix planned “Red Hat recommends updating org.eclipse.jetty/jetty-security to the latest version when a fix is available.”
  • Red Hat AMQ Broker 7 jetty-security 12.1.10.redhat-00001 Red Hat build of Apache Camel - HawtIO 4 jetty-security 12.1.10.redhat-00001 Red Hat build of Apache Camel for Spring Boot 4 jetty-security 12.1.10.redhat-00001 Red Hat build of Apicurio Registry 3 jetty-security 12.1.10.redhat-00001 Red Hat build of Debezium 3 jetty-security 12.1.10.redhat-00001
    affected: workaround, no fix available “Red Hat recommends updating org.eclipse.jetty/jetty-security to the latest version when a fix is available.”
  • Red Hat Fuse 7 jetty-security 12.1.10.redhat-00001 Red Hat Offline Knowledge Portal offline-knowledge-portal/rhokp-rhel9
    affected: workaround, no fix planned “Red Hat recommends updating org.eclipse.jetty/jetty-security to the latest version when a fix is available.”
  • Red Hat Enterprise Linux 7 maven-wagon-scm, maven-wagon-javadoc, maven-wagon 2.4-3.el7, maven-wagon-provider-test Red Hat Enterprise Linux 9 jmc Red Hat OpenShift AI (RHOAI) rhoai/odh-spark-operator-rhel9, rhoai/odh-th-torch-cpu-py312-rhel9, rhoai/odh-th-torch-cuda-py312-rhel9, rhoai/odh-th06-cpu-torch210-py312-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-rocm64-torch291-py312-rhel9, +2 more Red Hat OpenShift Dev Spaces devspaces/openvsx-rhel9, devspaces/pluginregistry-rhel9 Red Hat Satellite 6 openvox-server 8.15.2-1.el9sat
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
25 d ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/jetty/jetty.project/security/advisories/GHSA-53x7-f9fc-h7qr referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.