CVE-2026-18661

Authorization Bypass via Mixed @ServletSecurity and web.xml Constraints in Eclipse Jetty

Published Oct 15, 2026 CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Description
In Eclipse Jetty, across various versions of `jetty-annotations`, and `jetty-eeN-annotations`, the Jakarta Spec authoritative url-pattern rules for mixed `@ServletSecurity` annotation, and `web.xml` defined `security-constraint` on the same `url-pattern` were not being applied if the `web.xml` had more than 1 `url-pattern` for a servlet, and had a `security-constraint` applying to only some of those `url-pattern` definitions.

Remediation

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History
Type Values Removed Values Added
Title Authorization Bypass via Mixed @ServletSecurity and web.xml Constraints in Eclipse Jetty
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-annotations`, and `jetty-eeN-annotations`, the Jakarta Spec authoritative url-pattern rules for mixed `@ServletSecurity` annotation, and `web.xml` defined `security-constraint` on the same `url-pattern` were not being applied if the `web.xml` had more than 1 `url-pattern` for a servlet, and had a `security-constraint` applying to only some of those `url-pattern` definitions.
Weaknesses CWE-863
References
Metrics cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N'}

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Weaknesses

Sources

Status
PUBLISHED
Assigner
eclipse
Published
Updated
Oct 15, 2026, 1:46 PM
Reserved
Aug 3, 2026, 1:21 PM
Status
Awaiting Analysis
Published
Oct 15, 2026, 9:17 AM
Modified
Oct 15, 2026, 2:41 PM