Read the docs
TI-2026-78797 Aliases CVE-2026-111832GHSA-2hrr-86cg-w5v9

Unrestricted file upload in WordPress WP Mailster plugin

Priority MEDIUM 49CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-434.

Summary

The WP Mailster plugin for WordPress, from 0 through 1.9.1.0, accepts uploads of dangerous file types without restriction (CWE-434). An unauthenticated remote attacker can upload a web shell to the web server and fully compromise its confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Unrestricted Upload of File with Dangerous Type vulnerability in WP Mailster WP Mailster wp-mailster allows Upload a Web Shell to a Web Server.This issue affects WP Mailster: from n/a through 1.9.1.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00405 35th 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
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
brandtossWP Mailsterup to 1.9.1.0—No fix listedCNA
  • WP Mailster Vendorbrandtoss Affected up to 1.9.1.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for WP Mailster.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-111832
  2. 2026-10-21 Alias added: GHSA-2hrr-86cg-w5v9
  3. 2026-10-21 CISA SSVC decision points changed

References

Other 1

  • TI-2024-36003 WordPress WP Mailster plugin <= 1.8.16.0 - Broken Access Control vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2024-36005 WordPress WP Mailster plugin <= 1.8.16.0 - SQL Injection vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2024-36002 WordPress WP Mailster plugin <= 1.8.16.0 - Sensitive Data Exposure vulnerability CVSS 3.1HIGH 7.5
  • TI-2025-16207 WordPress WP Mailster plugin <= 1.8.17.0 - Sensitive Data Exposure vulnerability CVSS 3.1HIGH 7.5
  • TI-2024-36001 WordPress WP Mailster plugin <= 1.8.16.0 - Broken Access Control vulnerability CVSS 3.1HIGH 8.8
  • TI-2024-36443 WordPress WP Mailster plugin <= 1.8.17.0 - Cross Site Request Forgery (CSRF) vulnerability CVSS 3.1HIGH 8.8
See all 18 →

Sources

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