CVE-2023-6621 Post SMTP < 2.8.7 - Reflected Cross-Site Scripting
Reflected XSS in POST SMTP plugin allows attackers to execute scripts against admin users, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-6621?
CVE-2023-6621 is a medium-severity cross-site scripting vulnerability in Unknown POST SMTP, published on 3 Jan 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The POST SMTP WordPress plugin before 2.8.7 does not sanitise and escape the msg parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.
Weakness: CWE-79
Which versions are affected by CVE-2023-6621?
It affects 1 product.
Products include Wpexperts Post Smtp.
How do I fix CVE-2023-6621?
No fix has been published for CVE-2023-6621 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-2023-6621 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-6621 exists.
Other vulnerabilities in Unknown POST SMTP
- CVE-2023-6875 Auth bypass in Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
- CVE-2023-3179 POST SMTP Mailer < 2.5.7 - Account Takeover via CSRF
- CVE-2023-52233 WordPress POST SMTP Mailer plugin <= 2.8.6 - Broken Access Control on API vulnerability
- CVE-2024-52436 WordPress Post SMTP plugin <= 2.9.9 - SQL Injection vulnerability
- CVE-2025-0521 Post SMTP <= 3.0.2 - Unauthenticated Stored Cross-Site Scripting
Sources
Also known as GHSA-gr9g-7x3w-8vjj.