Strategic Overview
- Status
- Patched in 1.2.3.20
- Affected Plugin
- Gmail SMTP
- Affected Version
<= 1.2.3.19- CVSS
- 4.3Medium
- Weakness type
- CWE-352 · Cross-Site Request Forgery (CSRF)
- CVE
CVE-2026-57657
At a glance
CVE-2026-57657 is a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the Gmail SMTP WordPress plugin, affecting versions <= 1.2.3.19. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.2.3.20; sites on affected versions should update now. Disclosed June 2026, reported by Ananda Dhakal.
Vulnerability Overview
The Gmail SMTP plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.2.3.19. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to perform an unauthorized action via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.
CWE-352: Cross-Site Request Forgery (CSRF)
Reaching this weakness in Gmail SMTP <= 1.2.3.19 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.
An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Gmail SMTP the fix is 1.2.3.20: builds <= 1.2.3.19 are affected, anything from 1.2.3.20 onward is not.
Remediation
Update to version 1.2.3.20, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Gmail SMTP: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Gmail SMTP 1.2.3.20 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C