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.

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 visi…

Vulnerability class: CSRF (Cross-Site Request Forgery)

EPSS: 0.001 (0.9th 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)

CWE-352 — Cross-Site Request Forgery (CSRF)

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.