Improper Authorization Vulnerability in mall4j Affects User Cart Management
CVE-2026-108691

5.3MEDIUM

Key Information:

Vendor

Gz-yami

Status
Mall4j
Vendor
CVE Published:
11 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-108691?

An improper authorization vulnerability exists in mall4j version 4.0 that allows authenticated storefront customers to manipulate other users' cart items. Exploiting an operator precedence error in the cleanExpiryProdList SQL query, attackers can issue a single DELETE request to the endpoint /p/shopCart/cleanExpiryProdList, thereby deleting all items in other users' carts for out-of-stock products. This compromise undermines user trust and can result in significant frustrations for genuine customers, as these cart items do not return when products are restocked.

Affected Version(s)

mall4j 0 <= 4.0

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-2026-108691 - Proof of Concept

References

https://github.com/AnkesKasty/cve-request-poc/blob/a7b6d1...
exploit
https://github.com/gz-yami/mall4j/blob/ffc672fc1aa4320ce0...
technical-description
https://github.com/gz-yami/mall4j/blob/ffc672fc1aa4320ce0...
technical-description

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
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

Yaqi Chao
.