Open Redirect in Koajs Koa
CVE-2025-62595
Koa is expressive middleware for Node.js using ES2017 async functions. In versions 2.16.2 to before 2.16.3 and 3.0.1 to before 3.0.3, a bypass to CVE-2025-8129 was discovered in the Koa.js framework affecting its back redirect functionalit…
Vulnerability class: Open Redirect
EPSS: 0.003 (19.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
Affected products
- Koajs Koa — versions >= 2.16.2, < 2.16.3, >= 3.0.1, < 3.0.3, 2.16.2
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-62595?
- CVE-2025-62595 is a medium-severity vulnerability in Koajs Koa, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2025-10-21.
- How severe is CVE-2025-62595?
- Medium severity. CVSS v3 base score is 4.3 out of 10.