Unauthenticated Access Vulnerability in Evolution API by Evolution Foundation
CVE-2026-91997

6.9MEDIUM

Key Information:

Vendor

Evolution-foundation

Status
Evolution-api
Vendor
CVE Published:
15 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-91997?

A vulnerability in the Evolution API (up to version 2.3.7) allows attackers to bypass the metricsIPWhitelist middleware due to an incorrect array comparison that consistently evaluates to false. This flaw enables unauthenticated users to access the /metrics endpoint, exposing critical information including server version, database client name, server URL configurations, and WhatsApp instance details. As a result, attackers can gain insights into sensitive system metrics, potentially facilitating further exploitation.

Affected Version(s)

evolution-api 0 <= 2.3.7

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-91997 - Proof of Concept

References

https://github.com/geo-chen/oss/blob/main/evolution-api.md
third-party-advisoryexploit
https://github.com/evolution-foundation/evolution-api/blo...
technical-description
https://github.com/evolution-foundation/evolution-api
product

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.