CVEvulnerability
CVE-2026-9495
5.5 MEDIUM
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-05-26
- Last modified
- 2026-07-23
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 5.5 MEDIUM — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
- CVSS 3.1 ([email protected])
- 7.3 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Weaknesses
- CWE-284
Description
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.
Related
Weakness · CWE (1)
- CWE-284 Improper Access Control weakness
References
- https://github.com/koajs/router/commit/d53e17f284557b1f417946f9807ee52290c3c759 github.com
- https://github.com/koajs/router/issues/202 github.com
- https://github.com/koajs/router/pull/206 github.com
- https://security.snyk.io/vuln/SNYK-JS-KOAROUTER-12215044 security.snyk.io
- https://github.com/koajs/router/pull/206 github.com