CVE-2026-57813 CRITICAL

CVE-2026-57813: WordPress MailOptin plugin <= 1.2.77.3 - Privilege Escalation vulnerability

Vendor Properfraction

Product MailOptin

Weakness CWE-266

Published July 13, 2026

Last update July 13, 2026

View on NVD All CVEs

CVSS base score

9.8/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality High

Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

Incorrect Privilege Assignment vulnerability in properfraction MailOptin mailoptin allows Privilege Escalation.This issue affects MailOptin: from n/a through <= 1.2.77.3.

Explanation of Vulnerability in Simple Terms

02Summary

MailOptin versions up to 1.2.77.3 contain a privilege escalation vulnerability that allows unauthenticated attackers to gain full control of the application. The vulnerability requires no user interaction and can be exploited over the network. An attacker can read, modify, or delete any data and disrupt service availability.

What an attacker can do

03Attacker Capabilities

Run arbitrary code, read all data, modify or delete content, and disable the application without authentication.

Potential impact on your site

04Site Impact

Complete compromise of MailOptin and any site using it; attacker gains full administrative control.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

July 13, 2026 CVE published

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-57813 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/266.html AskarLabs — CWE-266 write-up Incorrect Privilege Assignment

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