CVE-2026-57813 properfraction CVE debrief

Who should care

Administrators and users of the MailOptin plugin for WordPress should be aware of this critical vulnerability and take immediate action to protect their installations. This includes reviewing and restricting user privileges, monitoring for suspicious activity, and updating the plugin to a version beyond 1.2.77.3.

Technical summary

The MailOptin plugin for WordPress has a critical vulnerability, CVE-2026-57813, with a CVSS score of 9.8. This Incorrect Privilege Assignment vulnerability allows for Privilege Escalation. The issue affects versions from n/a through 1.2.77.3. The vulnerability has a high impact on the system's security, and defenders should review and restrict user privileges to prevent exploitation.

Defensive priority

High

Recommended defensive actions

• Update MailOptin plugin to a version beyond 1.2.77.3
• Review and restrict user privileges
• Monitor for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

Evidence is limited; verify vulnerability status with official sources. The CVE record was published on 2026-07-13T10:16:45.270Z and has not been modified since then. Limited source detail is available; defenders should verify affected scope and severity with official advisories.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.