Stored XSS Vulnerability in Transbank Webpay Plugin for WordPress
CVE-2026-6858

7.1HIGH

Key Information:

Vendor

WordPress
Status
Transbank Webpay
Vendor
CVE Published:
22 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6858?

The Transbank Webpay plugin for WordPress, prior to version 1.14.0, exposes a vulnerability due to improper sanitization and escaping of logs. This flaw allows unauthenticated attackers to execute Stored XSS attacks, potentially compromising the accounts of logged-in administrators. Such vulnerabilities can lead to unauthorized actions within the administrative dashboard, making it crucial for users to upgrade to the latest version to mitigate this risk.

Affected Version(s)

Transbank Webpay 0 < 1.14.0

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-2026-6858 - Proof of Concept

References

https://wpscan.com/vulnerability/81035d75-81a5-486a-a9fb-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mateo Contenla & Matías Schiappacasse
WPScan
.