Local File Deletion Vulnerability in MailerSend WordPress Plugin by MailerSend
CVE-2026-13156

5.4MEDIUM

Key Information:

Vendor

WordPress
Status
Mailersend
Vendor
CVE Published:
20 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-13156?

The MailerSend WordPress plugin prior to version 1.0.8 lacks a necessary nonce check for its configuration-delete action. While it verifies the manage_options capability, it fails to validate the nonce, allowing an attacker to potentially trick a logged-in administrator into visiting a maliciously crafted page. This could lead to the unintended wiping of the plugin's SMTP configuration, resulting in email delivery failures and potential disruption of the website's communication functionalities.

Affected Version(s)

MailerSend 0 < 1.0.8

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-2026-13156 - Proof of Concept

References

https://wpscan.com/vulnerability/595e653d-0904-43cf-8e61-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Huynh Kien Minh
WPScan
.