Vulnerabilities

CVE-2026-27064 | BDVDB-2026-351908 Detail

EverPressMailster

Description#

Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.

Impact#

CAPEC-17 Using Malicious Files

Weaknesses#

CWE-434 Unrestricted Upload of File with Dangerous Type

References#

https://patchstack.com/database/wordpress/plugin/mailster/vulnerability/wordpress-mailster-plugin-4-1-17-arbitrary-file-upload-vulnerability?_s_id=cve

Exploit#

No public exploit known

History#

Version 12026-07-23Record published in the CVE List.

Published

Published: 2026-07-23
Last modified: 2026-07-23

Vendor information

Vendor: EverPress
Product: Mailster

All EverPress vulnerabilities

Score

9.1 Critical

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 43.1.

KEV

No

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Unrestricted File Upload

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
<= 4.1.17
Fixed
Not stated
Vulnerable
Not stated
Fixed
4.1.18

Scoring System

CVSS v4.0

Not available

CVSS v3.1

9.1 Critical

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	High
User Interaction	None
Scope	Changed
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).