CVE-2025-3581 Newsletter < 8.8.5 - Admin+ Stored XSS via Widget
Admins can inject malicious scripts via widget options in the Newsletter plugin, bypassing unfiltered_html restrictions in multisite setups.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-3581?
CVE-2025-3581 is a medium-severity cross-site scripting vulnerability in Unknown Newsletter, published on 9 Jun 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
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).
Weakness: CWE-79
Which versions are affected by CVE-2025-3581?
It affects 1 product.
Products include Thenewsletterplugin Newsletter.
How do I fix CVE-2025-3581?
No fix has been published for CVE-2025-3581 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-3581 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3581 exists.
Other vulnerabilities in Unknown Newsletter
- CVE-2020-35933 Cross-site scripting in n/a
- CVE-2024-5317 Newsletter <= 8.3.4 - Unauthenticated Stored Cross-Site Scripting via np1
- CVE-2023-4772 Newsletter <= 7.8.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
- CVE-2023-27922 Cross-site scripting in Newsletter
- CVE-2022-1756 Newsletter < 7.4.5 - Reflected Cross-Site Scripting
Sources
Also known as GHSA-f9xh-499r-w9qx.