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PatchSiren cyber security CVE debrief

CVE-2026-6235 sendmachine CVE debrief

The Sendmachine for WordPress plugin is vulnerable to authorization bypass via the 'manage_admin_requests' function in all versions up to, and including, 1.0.20. This allows unauthenticated attackers to overwrite the plugin's SMTP configuration, potentially intercepting all outbound emails from the site. The vulnerability has a high CVSS score of 9.8 and is considered critical. Affected WordPress site administrators and security teams should verify plugin versions, review SMTP configurations, and monitor outbound emails for suspicious activity. Limited details on affected scope and vendor remediation are available, emphasizing the need for defensive verification and compensating controls for email security.

Vendor
sendmachine
Product
Sendmachine for WordPress
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-22
Original CVE updated
2026-08-06
Advisory published
2026-04-22
Advisory updated
2026-08-06

Who should care

WordPress site administrators, security teams, and email administrators should be aware of this vulnerability and take immediate action to protect their sites. They should verify plugin versions, review SMTP configurations, and monitor outbound emails for suspicious activity. Additionally, they should implement compensating controls for email security and conduct regular security audits to detect potential vulnerabilities.

Technical summary

The Sendmachine for WordPress plugin is vulnerable to authorization bypass via the 'manage_admin_requests' function in all versions up to, and including, 1.0.20. This is due to improper verification of user authorization. Unauthenticated attackers can exploit this to overwrite the plugin's SMTP configuration, potentially intercepting all outbound emails from the site. The vulnerability has a high CVSS score of 9.8 and is considered critical.

Defensive priority

High priority due to potential for email interception

Recommended defensive actions

  • Inventory and verify installed Sendmachine for WordPress plugin versions
  • Apply vendor patches or updates to affected plugin versions
  • Monitor outbound emails for suspicious activity
  • Implement compensating controls for email security
  • Review and update SMTP configurations to prevent unauthorized access
  • Conduct regular security audits to detect potential vulnerabilities
  • Verify email authentication mechanisms are properly configured

Evidence notes

The Sendmachine for WordPress plugin has a critical vulnerability (CVE-2026-6235) with potential for email interception. Evidence from Wordfence and NVD indicates a critical vulnerability in Sendmachine for WordPress plugin. Limited details on affected scope and vendor remediation. WordPress site administrators, security teams, and email administrators should verify plugin versions, review SMTP configurations, and monitor outbound emails for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-6235 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6235

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-6235 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6235

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.