CVE-2026-18659

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

Published Oct 15, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Jetty
Jetty jetty
Vendors & Products Jetty
Jetty jetty
Type Values Removed Values Added
Weaknesses CWE-358
References
Metrics threat_severity

None

cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

threat_severity

Moderate

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Unauthenticated authorization bypass in ConstraintSecurityHandler - HTTP method-omission matched by substring
Weaknesses CWE-863
References
Metrics cvssV4_0

{'score': 6.9, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
eclipse
Published
Updated
Oct 15, 2026, 1:26 PM
Reserved
Aug 3, 2026, 1:20 PM
Status
Awaiting Analysis
Published
Oct 15, 2026, 10:17 AM
Modified
Oct 15, 2026, 2:41 PM
Severity
Moderate
Public date
Oct 15, 2026, 9:44 AM