CVE-2023-0219: FluentSMTP < 2.2.3 - Stored XSS via Email Logs

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-03-13 · updated 2026-06-17
Weakness: CWE-79

Description

The FluentSMTP WordPress plugin before 2.2.3 does not sanitize or escape email content, making it vulnerable to stored cross-site scripting attacks (XSS) when an administrator views the email logs. This exploit requires other plugins to enable users to send emails with unfiltered HTML.

Affected products

techjewel FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider: before 2.2.3 — fixed in 2.2.3

How to fix

Upgrade to a fixed version: techjewel FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider 2.2.3. Check the vendor advisory for mitigations.

References

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