// For flags

CVE-2025-3581

Newsletter < 8.8.5 - Admin+ Stored XSS via Widget

Severity Score

4.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

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).

El complemento Newsletter de WordPress anterior a la versión 8.8.5 no valida ni escapa algunas de las opciones de su widget antes de mostrarlas nuevamente en una página o publicación donde está incrustado el bloque, lo que podría permitir a usuarios con privilegios elevados como el administrador realizar ataques de Cross Site Scripting almacenado incluso cuando la capacidad unfiltered_html no está permitida (por ejemplo, en una configuración de varios sitios).

The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 8.8.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

*Credits: Dmitrii Ignatyev, WPScan
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
Single
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
Poc
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2025-04-14 CVE Reserved
  • 2025-05-19 CVE Published
  • 2025-06-10 First Exploit
  • 2025-06-15 EPSS Updated
  • 2025-06-17 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Unknown
Search vendor "Unknown"
 Newsletter
Search vendor "Unknown" for product "Newsletter"
 < 8.8.5
Search vendor "Unknown" for product "Newsletter" and version " < 8.8.5"
en
Affected