CVE-2025-3584: newsletter XSS — Exploit

Description

The Newsletter WordPress plugin before 8.8.2 does not sanitise and escape some of its Subscription settings, 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).

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CVSS v3.1 Score

4.8

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
thenewsletterplugin	newsletter	< 8.8.2

References

Exploits

https://wpscan.com/vulnerability/76937bdd-7ffa-4b5e-ade1-60da095a03a3/ https://wpscan.com/vulnerability/76937bdd-7ffa-4b5e-ade1-60da095a03a3/

Frequently Asked Questions

What is CVE-2025-3584? +

The Newsletter WordPress plugin before 8.8.2 does not sanitise and escape some of its Subscription settings, 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). It has a CVSS v3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2025-3584? +

CVE-2025-3584 has a CVSS v3.1 score of 4.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-3584? +

CVE-2025-3584 affects products from thenewsletterplugin, specifically: newsletter. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-3584? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-3584