CVE-2026-9495
highpriority · track · 0EPSS 0.006 · 49 %ileEUUSEPSS · scored 2026-10-22
Versions of the package @koa/router from 14.0.0 and before 15.0.0 are vulnerable to Access Control Bypass due to the middleware being silently dropped from the execution chain when the router prefix contains path parameters. Depending on what the skipped middleware was supposed to protect, an attacker could bypass authentication and authorization, evade rate limiting or bypass input sanitization.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 2.7–7.3
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-47p6-69vm-vw6v@koa/router has an Access Control Bypass2026-05-26ghsa · osvUS
Versions of the package @koa/router from 14.0.0 and before 15.0.0 are vulnerable to Access Control Bypass due to the middleware being silently dropped from the execution chain when the router prefix contains path parameters. Depending on what the skipped middleware was supposed to protect, an attacker could bypass authentication and authorization, evade rate limiting or bypass input sanitization.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (12)
External citations — patches, advisories, analysis.
- https://github.com/koajs/router/commit/d53e17f284557b1f417946f9807ee52290c3c759cnnvd
- https://github.com/koajs/router/issues/202cnnvd
- https://github.com/koajs/router/pull/206cnnvd
- https://security.snyk.io/vuln/SNYK-JS-KOAROUTER-12215044cnnvd
- https://github.com/koajs/router/commit/d53e17f284557b1f417946f9807ee52290c3c759enisa_euvd
- https://github.com/koajs/router/issues/202enisa_euvd
- https://github.com/koajs/router/pull/206enisa_euvd
- https://security.snyk.io/vuln/SNYK-JS-KOAROUTER-12215044enisa_euvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan