CVE-2025-22303

WordPress WP Mailster plugin <= 1.8.17.0 - Sensitive Data Exposure vulnerability

5.3 Medium

Insertion of Sensitive Information Into Sent Data vulnerability in brandtoss WP Mailster wp-mailster allows Retrieve Embedded Sensitive Data.This issue affects WP Mailster: from n/a through <= 1.8.17.0.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

0.45%Up 0.4 points since Jan 8, 2025

What each source reports

CVE List Score used 5.3

WordPress WP Mailster plugin <= 1.8.17.0 - Sensitive Data Exposure vulnerability

Record: CVE-2025-22303
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-201
Updated: 2026-11-02

EUVDEUVD-2025-2703 5.3

Record: EUVD-2025-2703
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-8646-v3mf-m963 5.3

Insertion of Sensitive Information Into Sent Data vulnerability in brandtoss WP Mailster allows...

Insertion of Sensitive Information Into Sent Data vulnerability in brandtoss WP Mailster allows Retrieve Embedded Sensitive Data.This issue affects WP Mailster: from n/a through 1.8.17.0.

Record: GHSA-8646-v3mf-m963
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-201
Updated: 2026-11-02

NVD 5.3

Record: CVE-2025-22303
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-201
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-22303 is a medium vulnerability (CVSS 5.3) in Brandtoss Wp Mailster, published January 7, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. No source names a fixed version.