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TI-2026-79229 Aliases CVE-2026-111830GHSA-7h23-rphh-2c47

Stored cross-site scripting in WP Mailster WordPress plugin

Priority LOW 31CWE-79Published · Updated

Key facts

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

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

Summary

The WP Mailster WordPress plugin, versions through 1.9.1.0, does not neutralize user input in the web pages it generates (CWE-79). A remote attacker without privileges can store script that runs in a victim's browser after the victim interacts with the page, with limited impact on confidentiality, integrity and availability.

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

Description from the CNA

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WP Mailster WP Mailster wp-mailster allows Stored XSS.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 0.00201 10th 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
No
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
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. 2026-10-22 Threatist record created from CVE-2026-111830
  2. 2026-10-22 Alias added: GHSA-7h23-rphh-2c47
  3. 2026-10-22 CISA SSVC decision points changed
  4. 2026-10-22 Priority changed: MEDIUM → LOW

References

Other 1

  • TI-2024-36003 WordPress WP Mailster plugin <= 1.8.16.0 - Broken Access Control vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-78797 Unrestricted file upload in WordPress WP Mailster plugin CVSS 3.1CRITICAL 10.0
  • 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
See all 18 →

Sources

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