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TI-2026-21524 Aliases CVE-2026-27064GHSA-qwf2-rfq8-mpjg

WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability

Priority MEDIUM 42CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
High
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

Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00499 43rd 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
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
EverPressMailsterup to 4.1.17—No fix listedCNA
  • Mailster VendorEverPress Affected up to 4.1.17 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27064
  2. 2026-10-03 Alias added: GHSA-qwf2-rfq8-mpjg

References

Other 1

  • TI-2024-21410 WordPress Mailster plugin <= 4.0.6 - Unauthenticated Local File Inclusion vulnerability CVSS 3.1HIGH 8.1
  • TI-2025-39646 WordPress Mailster plugin < 4.1.14 - Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
  • TI-2025-26150 WordPress BruteGuard – Brute Force Login Protection plugin <= 0.1.4 - Reflected Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1

Sources

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