CSRF in Mailersend
CVE-2026-13156
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.
Vulnerability class: CSRF (Cross-Site Request Forgery)
EPSS: 0.001 (3.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.
Affected products
- Unknown Mailersend — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- contact@wpscan.com (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-13156?
- CVE-2026-13156 is a medium-severity vulnerability in Mailersend, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-07-20.
- How severe is CVE-2026-13156?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2026-13156 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.