---
title: "CVE-2026-18661: Eclipse Jetty - Broken Access Control"
description: "Eclipse Jetty jetty-annotations and jetty-eeN-annotations contain a broken access control caused by incorrect application of Jakarta Spec url-pattern rules when mixed @ServletSecurity and web.xml security-constraints exist, letting attackers bypass security constraints on some url-patterns, exploit requires specific web.xml configuration with multiple url-patterns."
url: https://panop.io/threat-heartbeat/CVE-2026-18661/
---

# CVE-2026-18661 Eclipse Jetty - Broken Access Control

Eclipse Jetty jetty-annotations and jetty-eeN-annotations contain a broken access control caused by incorrect application of Jakarta Spec url-pattern rules when mixed @ServletSecurity and web.xml security-constraints exist, letting attackers bypass security constraints on some url-patterns, exploit requires specific web.xml configuration with multiple url-patterns.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-18661)

## Details

Type

Broken Access Control

Impact

Broken Access Control

CVSS 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/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

Published

15 October 2026

Updated

15 October 2026

Weakness

[CWE-863](https://cwe.mitre.org/data/definitions/863.html)

## Vendor fix

Update to the latest version of jetty-annotations and jetty-eeN-annotations where this issue is fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-18661](https://nvd.nist.gov/vuln/detail/CVE-2026-18661)
- [https://github.com/jetty/jetty.project/security/advisories/GHSA-v6xf-996f-c35f](https://github.com/jetty/jetty.project/security/advisories/GHSA-v6xf-996f-c35f)
- [https://gitlab.eclipse.org/security/cve-assignment/-/work\_items/211](https://gitlab.eclipse.org/security/cve-assignment/-/work_items/211)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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