CVE-2026-13156 MailerSend - Official SMTP Integration < 1.0.8 - Settings Deletion and Plugin Deactivation via CSRF
An attacker can trick an administrator into deleting SMTP settings and deactivating the plugin, disrupting email delivery.
- 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-2026-13156?
CVE-2026-13156 is a medium-severity vulnerability in Unknown MailerSend, published on 20 Jul 2026. 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 MailerSend WordPress plugin before 1.0.8 does not perform a nonce check on its configuration-delete action (it verifies the manage_options capability but ignores the nonce), so an attacker can trick a logged-in administrator into visiting a crafted page that wipes the MailerSend WordPress plugin before 1.0.8's SMTP configuration and deactivates the MailerSend WordPress plugin before 1.0.8, breaking the site's email delivery.
Weakness: CWE-352
Which versions are affected by CVE-2026-13156?
How do I fix CVE-2026-13156?
No fix has been published for CVE-2026-13156 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-13156 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13156 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-h2v3-9w9f-v798.