TI-2026-02670 Aliases CVE-2026-3090 GHSA-52gc-pp77-vw4g

Post SMTP <= 3.8.0 - Unauthenticated Stored Cross-Site Scripting via 'event_type'

LOW 37CWE-79Published 2026-03-18 · Updated 2026-04-08

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 – 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 ‘event_type’ parameter in all versions up to, and including, 3.8.0 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. The vulnerability is only exploitable when the Post SMTP Pro plugin is also installed and its Reporting and Tracking extension is enabled.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00243 15th 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

Vendor	Product	Affected versions	Fixed in	Status	Source
saadiqbal	Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App	up to 3.8.0	—	No fix listed	CNA

Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App Vendorsaadiqbal Affected up to 3.8.0 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:wpexperts:post_smtp::::::::	—	—	WPExperts

cpe:2.3:a:wpexperts:post_smtp:*:*:*:*:*:*:*:* Versions — — ·WPExperts

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-3090
2026-10-03 Alias added: GHSA-52gc-pp77-vw4g

References

Other 3

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