CVE-2026-15604: Toocheke Companion <= 2.10 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'series_bg_color' Post Meta
The Toocheke Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 2.10 via the 'seriesbgcolor' post meta field. This is due to insufficient input sanitization in the toochekeseriesbgcolorsave() function (which stores the raw $POST value in post meta) and insufficient output escaping in the series admin column rendering (where the stored value is concatenated into a style attribute without escattr()). This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user, such as an administrator, accesses the series list table in the admin dashboard.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
WordPress Toocheke Companion pluginto a version that resolves this vulnerability.Fixed in 2.10 - Configuration
Fix the toocheke_series_bg_color_save() handling by sanitizing the incoming $_POST value before saving to the 'series_bg_color' post meta, and fix the series admin column rendering to escape the stored value with esc_attr() before inserting it into the style attribute.
Toocheke Companion plugin for WordPress series_bg_color post meta sanitization/output escaping = Sanitize on save and escape on render (use esc_attr() when concatenating into the style attribute)
Event History
Frequently Asked Questions
What is the severity of CVE-2026-15604?
CVE-2026-15604 has a medium severity rating of 6.4.
How do I fix CVE-2026-15604?
To fix CVE-2026-15604, update the Toocheke Companion plugin to version 2.11 or later.
What kind of vulnerability is CVE-2026-15604?
CVE-2026-15604 is a Stored Cross-Site Scripting (XSS) vulnerability.
Who is affected by CVE-2026-15604?
Users of the Toocheke Companion plugin for WordPress, particularly those using versions 2.10 and below, are affected by CVE-2026-15604.
What causes the vulnerability in CVE-2026-15604?
The vulnerability in CVE-2026-15604 is caused by insufficient input sanitization in the toocheke_series_bg_color_save() function.