Weak Cryptographic Implementation in Ecommerce Systempay Payment Processing
CVE-2020-37168

9.3CRITICAL

Key Information:

Vendor

Paiement

Status
Ecommerce Systempay
Vendor
CVE Published:
13 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-37168?

The Ecommerce Systempay 1.0 system contains a vulnerability related to its cryptographic implementation. This weakness allows attackers to exploit the 16-character production secret key used for generating payment signatures. By capturing POST requests directed toward the payment endpoint, attackers can retrieve payment form data along with signatures. They can then use a brute-force approach with SHA1 hash comparison to identify the correct production key. Successfully obtaining this key enables attackers to forge legitimate payment signatures and alter transaction amounts, thereby compromising the integrity of payment processing.

Affected Version(s)

Ecommerce Systempay 1.0

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-2020-37168 - Proof of Concept

References

https://www.exploit-db.com/exploits/48017
exploit
https://paiement.systempay.fr/doc/fr-FR/
product
https://paiement.systempay.fr/doc/fr-FR/module-de-paiemen...
product

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
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

live3
.