Toocheke Companion <= 2.10 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'series_bg_color' Post Meta
Strategic Overview
- Status
- Patched in 2.11
- Affected Plugin
- Toocheke Companion
- Affected Version
<= 2.10- CVSS
- 6.4Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2026-15604
At a glance
CVE-2026-15604 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Toocheke Companion WordPress plugin, affecting versions <= 2.10. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 2.11; sites on affected versions should update now. Disclosed August 2026, reported by Wordfence PRISM.
Vulnerability Overview
The Toocheke Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 2.10 via the 'series_bg_color' post meta field. This is due to insufficient input sanitization in the toocheke_series_bg_color_save() 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 esc_attr()). 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.
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 interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Toocheke Companion <= 2.10 carries this weakness at series_bg_color, and reaching it takes an account at Contributor level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Toocheke Companion the fix is 2.11: builds <= 2.10 are affected, anything from 2.11 onward is not.
Remediation
Update to version 2.11, or a newer patched version
How does WordSec protect against this?
An attacker needs Contributor access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Toocheke Companion 2.11 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C