CVE-2025-62595

MEDIUM EPSS 19.5%
Published Oct 21, 20258mo ago · Modified Jun 17, 20261w ago
6.1 CVSS 3.1
Medium
Find Similar
Published Oct 21, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

Description

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 functionality. In certain circumstances, an attacker can manipulate the Referer header to force a user’s browser to navigate to an external, potentially malicious website. This occurs because the implementation incorrectly treats some specially crafted URLs as safe relative paths. Exploiting this vulnerability could allow attackers to perform phishing, social engineering, or other redirect-based attacks on users of affected applications. This issue has been patched in version 3.0.3.

CVSS Details

Base Score
6.1
Exploitability
2.8
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
19.5% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-601

Affected Products 2

VendorProductVersionRange
koajskoa*≥3.0.1  –  <3.0.3
koajskoa2.16.2any

References 2

  • github.com https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
    Patch
  • github.com https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
    Patch