Vulnerability · Published Oct 15, 2026 · Assigned by eclipse
CVE-2026-18659Unauthenticated authorization bypass in ConstraintSecurityHandler - HTTP method-omission matched by substring
Medium 6.9
In plain English
A medium-severity incorrect authorization in org.eclipse.jetty.ee10:jetty-ee10-servlet from Eclipse Foundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.4%top 64.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | jetty12 | no fix listed | DEBIAN-CVE-2026-18659 |
| Debian:14 | jetty12 | 12.0.39-1 | DEBIAN-CVE-2026-18659 |
| Debian:12 | jetty9 | no fix listed | DEBIAN-CVE-2026-18659 |
| Debian:13 | jetty9 | no fix listed | DEBIAN-CVE-2026-18659 |
| Debian:14 | jetty9 | no fix listed | DEBIAN-CVE-2026-18659 |
| Ubuntu:26.04:LTS | jetty12 | no fix listed | UBUNTU-CVE-2026-18659 |
| Ubuntu:26.10 | jetty12 | no fix listed | UBUNTU-CVE-2026-18659 |
| Ubuntu:22.04:LTS | jetty9 | no fix listed | UBUNTU-CVE-2026-18659 |
| Ubuntu:24.04:LTS | jetty9 | no fix listed | UBUNTU-CVE-2026-18659 |
| Ubuntu:26.04:LTS | jetty9 | no fix listed | UBUNTU-CVE-2026-18659 |
| Ubuntu:26.10 | jetty9 | no fix listed | UBUNTU-CVE-2026-18659 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Eclipse Foundation | org.eclipse.jetty.ee11:jetty-ee11-servlet | 12.1.0 – through 12.1.11 |
| Eclipse Foundation | org.eclipse.jetty.ee10:jetty-ee10-servlet | 12.1.0 – through 12.1.1112.0.0 – through 12.0.38 |
| Eclipse Foundation | org.eclipse.jetty.ee9:jetty-ee9-security | 12.1.0 – through 12.1.1112.0.0 – through 12.0.38 |
| Eclipse Foundation | org.eclipse.jetty.ee8:jetty-ee8-security | 12.1.0 – through 12.1.1112.0.0 – through 12.0.38 |
| Eclipse Foundation | org.eclipse.jetty:jetty-security | 11.0.0 – through 11.0.3210.0.0 – through 10.0.327.6.13 – through 9.4.64 |
Weakness: CWE-863 · 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