CVE-2022-1393: WP Subtitle < 3.4.1 - Contributor+ Stored Cross-Site Scripting

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-05-16 · updated 2026-06-17
Weakness: CWE-79

Description

The WP Subtitle WordPress plugin before 3.4.1 adds a subtitle field and provides a shortcode to display it via [wp_subtitle]. The subtitle is stored as a custom post meta with the key: "wps_subtitle", which is sanitized upon post save/update, however is not sanitized when updating it directly from the post meta update button (via AJAX) - and this makes the XSS exploitable by authenticated users with a role as low as contributor.

Affected products

WP Subtitle: before 3.4.1 — fixed in 3.4.1

How to fix

Upgrade to a fixed version: WP Subtitle 3.4.1. Check the vendor advisory for mitigations.

References

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