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TI-2026-68025 Aliases CVE-2026-75962GHSA-rqrg-rqr2-f4pg

Stored cross-site scripting in Post SMTP WordPress plugin

Priority LOW 37CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

The Post SMTP WordPress plugin in all versions up to and including 4.0.1 has a stored cross-site scripting flaw (CWE-79) in the user_email parameter. Insufficient sanitization and escaping let an unauthenticated attacker store scripts that run when a user opens the affected page. On Multisite sites with public registration, an email address with numeric HTML character references is saved unchanged to the email log.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

The Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 4.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable without authentication on WordPress Multisite installations with public registration enabled, as WordPress accepts email addresses containing numeric HTML character references that Post SMTP's stricter validator rejects, persisting the attacker-controlled address verbatim to the email log via the failed-send exception message.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00278 20th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
saadiqbalPost SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile Appup to 4.0.1—No fix listedCNA
  • Post SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App Vendorsaadiqbal Affected up to 4.0.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Post SMTP.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-75962
  2. 2026-10-06 Alias added: GHSA-rqrg-rqr2-f4pg
  3. 2026-10-07 Priority changed: MEDIUM → LOW
  4. 2026-10-09 CISA SSVC decision points changed

References

Other 8

  • TI-2025-10849 Missing authorization in saadiqbal Post SMTP – Complete Email Deliverability and SMTP… CVSS 3.1CRITICAL 9.8
  • TI-2024-29006 WordPress myCred plugin <= 2.7.2 - PHP Object Injection vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2025-36263 WordPress All In One Login plugin <= 2.0.8 - Bypass Vulnerability vulnerability CVSS 3.1CRITICAL 9.1
  • TI-2026-05814 WPFormify <= 1.1.1 - Missing Authorization CVSS 3.1HIGH 8.2
  • TI-2025-42518 WordPress New User Approve plugin <= 3.2.0 - Broken Access Control vulnerability CVSS 3.1HIGH 8.6
  • TI-2024-35074 WordPress User Management plugin <= 1.1 - Arbitrary File Upload vulnerability CVSS 3.1CRITICAL 9.9
See all 77 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences