CVE-2026-75962 Cross-site scripting in Post SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
Unauthenticated attackers can inject scripts via email parameters in WordPress Multisite, leading to stored XSS execution for users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-75962?
CVE-2026-75962 is a high-severity cross-site scripting vulnerability in saadiqbal Post SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 4.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable without authentication on WordPress Multisite installations with public registration enabled, as WordPress accepts email addresses containing numeric HTML character references that Post SMTP's stricter validator rejects, persisting the attacker-controlled address verbatim to the email log via the failed-send exception message.
Weakness: CWE-79
Which versions are affected by CVE-2026-75962?
How do I fix CVE-2026-75962?
No fix has been published for CVE-2026-75962 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-2026-75962 being exploited?
There is no known exploitation of CVE-2026-75962 in the wild and no public exploit code.
Sources
Also known as GHSA-rqrg-rqr2-f4pg.