Cyberdudebivash

Overview

• Vulnerability: WP Mailgun SMTP Plugin — Authorization Bypass
• CVE ID: CVE-2025-48327
• Status: Critical — Enables unauthenticated or low-privilege users to abuse plugin functionality
• Component: WordPress Mailgun SMTP plugin (≤ version 1.0.7)
• Plugin Type: Email delivery interface via Mailgun for WordPress

What Went Wrong

According to VulDB, versions up to 1.0.7 of the WP Mailgun SMTP plugin contain an authorization flaw that allows unauthenticated or low-privileged users to bypass normal access controls, granting them unauthorized capabilities within email operations. ([turn0search0])

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Attack Vector & Threat Scenario

• Trigger: Crafted HTTP request targeting plugin endpoints that mistakenly validate only the login-status or don’t enforce proper privilege checks.
• Type: Authorization bypass
• Impact:
  • Access to email logs
  • Possible interception of password reset emails
  • Ability to send emails as the site
• Exposure: High — vulnerable endpoints are often exposed, and low-privileged WordPress user accounts are common.

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Impact Assessment

• Confidentiality: High — Risk of unauthorized data access via email logs or intercepted correspondence.
• Integrity: High — Attackers could send phishing emails, impersonate admins, manipulate site workflows.
• Availability: Moderate — While direct DoS is unlikely, phishing and impersonation can disrupt operations.

Target audience: WordPress sites using WP Mailgun SMTP plugin — especially those with low-privilege user tiers or public registration enabled.

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Mitigation & Remediation

• Apply vendor fix immediately — upgrade to version 1.0.8 or later (if released) which patches the authorization logic.
• Temporary Workarounds:
  • Restrict access to plugin endpoints via .htaccess, WAF, or IP allow-lists.
  • Disable plugin entirely if not mission-critical.
  • Block REST API calls related to Mailgun plugin using WAF rules.

Detection & Threat Hunting

• Indicators of Exploitation:
  • Unexpected email deliveries not initiated by Admins.
  • Access logs showing GET/POST requests by low-privileged users targeting plugin routes.
  • Password reset emails seen in logs originating from Subscriber or Contributor accounts.
• Monitoring Tips:
  • Enable comprehensive WordPress logging for REST API and plugin-specific routes.
  • Create alerts for email sent patterns originating from non-Admin roles.

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Risk Rating

• CVSS v3.x (Estimated): 9.0 – Critical
• Exploitability: High — easy to exploit via web interface
• Impact: High — potential for full site takeover or credential capture

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References

• VulDB summary: WP Mailgun SMTP Plugin authorization flaw in ≤1.0.7 ([turn0search0])
• Patchstack analysis (related pattern in Post SMTP plugin): Broken access control for low-priv users — leading to email log exposure and account takeover ([turn0search6])
  • Note: While this is for a different plugin (Post SMTP), it mirrors the same broken authorization design pattern.

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CyberDudeBivash Recommendation

Patch NOW. Don’t let low-privileged accounts become your site’s Achilles’ heel.

1. Update the plugin to the patched version.
2. Audit access logs for suspicious REST/API activity.
3. Alert your SecOps or webmaster team to tighten REST endpoint exposure and user roles.

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Author: CyberDudeBivash
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