Open Redirect in Koajs Koa
CVE-2025-8129
A vulnerability, which was classified as problematic, was found in KoaJS Koa up to 3.0.0. Affected is the function back in the library lib/response.js of the component HTTP Header Handler. The manipulation of the argument Referrer leads to open redirect. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
Vulnerability class: Open Redirect
EPSS: 0.002 (13.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
Affected products
- Koajs Koa — versions 3.0, 3.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
- cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
- cna@vuldb.com (issue-tracking, Exploit, Patch, Issue Tracking, Vendor Advisory)
- cna@vuldb.com (issue-tracking, Exploit, Patch, Third Party Advisory, exploit, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-8129?
- CVE-2025-8129 is a low-severity vulnerability in Koajs Koa, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.5/10. Published 2025-07-25.
- How severe is CVE-2025-8129?
- Low severity. CVSS v3 base score is 3.5 out of 10.
- Is CVE-2025-8129 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.