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Vulnerability record · CVE-2025-8129 · published 25 July 2025

CVE-2025-8129: Koajs koa open redirect vulnerability

KKoajs · Koa

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.

2.0 CVSS 4.0 Low EPSS 0.24% · top 86.1% CWE-601 · Open redirect
2.0CVSS 4.0 base score, v2 4.0
0.24%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 3 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/koajs/koa/issues/1892 ExploitIssue TrackingPatchVendor Advisory
https://github.com/koajs/koa/issues/1892#issue-3213028583 ExploitIssue TrackingPatchThird Party AdvisoryVendor Advisory
https://vuldb.com/?ctiid.317514 Permissions RequiredVDB Entry
https://vuldb.com/?id.317514 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.619741 Third Party AdvisoryVDB Entry
https://github.com/koajs/koa/issues/1892 ExploitIssue TrackingPatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-8129), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.