How to fix CVE-2025-3581?

Within 30 days: Identify affected systems running before 8.8.5 does not validate and escape some of its Widget and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Is Newsletter affected by CVE-2025-3581?

Organizations using before 8.8.5 does not validate and escape some of its Widget options should be aware of moderate risk from CVE-2025-3581, a cross-site scripting vulnerability rated CVSS 4.8. Attackers could inject scripts to steal sessions or perform actions as authenticated users.

CVE-2025-3581

EUVD-2025-17435 MEDIUM

2025-06-09 [email protected]

WordPress XSS Newsletter PHP

4.8

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

patch_available

Apr 16, 2026 - 05:29 EUVD

8.8.5

Analysis Generated

Mar 14, 2026 - 19:21 vuln.today

EUVD ID Assigned

Mar 14, 2026 - 19:21 euvd

EUVD-2025-17435

PoC Detected

Jun 12, 2025 - 16:16 vuln.today

Public exploit code

CVE Published

Jun 09, 2025 - 06:15 nvd

MEDIUM 4.8

DescriptionNVD

The Newsletter WordPress plugin before 8.8.5 does not validate and escape some of its Widget options before outputting them back in a page/post where the block is embed, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

AnalysisAI

Technical ContextAI

Cross-site scripting (XSS) allows injection of client-side scripts into web pages viewed by other users due to insufficient output encoding.

RemediationAI

Encode all user-supplied output contextually (HTML, JS, URL). Implement Content Security Policy (CSP) headers. Use HTTPOnly and Secure cookie flags.

CVE-2025-3581 vulnerability details – vuln.today

Back