TI-2021-09899 Aliases CVE-2021-28975 GHSA-2rqf-fc8m-jwgp

WP Mailster 1.6.18.0 allows XSS when a victim opens a mail server's details in the…

LOW 29CWE-79Published 2021-10-21 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
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 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

WP Mailster 1.6.18.0 allows XSS when a victim opens a mail server's details in the mst_servers page, for a crafted server_host, server_name, or connection_parameter parameter.

Why it matters now

EPSS 0.00895 59th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:wpmailster:wp_mailster:1.6.18:::::wordpress::	1.6.18	Vulnerable	brandtoss

cpe:2.3:a:wpmailster:wp_mailster:1.6.18:*:*:*:*:wordpress:*:* Versions 1.6.18 Vulnerable ·brandtoss

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-28975
2026-10-03 Alias added: GHSA-2rqf-fc8m-jwgp

References

Exploit 1

https://www.compass-security.com/fileadmin/Research/Advisories/2021-18_CSNC-2021-018-WPMailster_XSS_CSRF.txt

Advisory 1

https://www.compass-security.com/en/research/advisories/

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 11 →

Sources

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