CVE-2026-15604 Toocheke Companion <= 2.10 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'series_bg_color' Post Meta
Authenticated attackers can inject arbitrary scripts via post meta, leading to code execution or account takeover when admins view the series list.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15604?
CVE-2026-15604 is a medium-severity cross-site scripting vulnerability in Toocheke Companion, published on 16 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-15604?
How do I fix CVE-2026-15604?
No fix has been published for CVE-2026-15604 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-15604 being exploited?
There is no known exploitation of CVE-2026-15604 in the wild and no public exploit code.
Sources
Also known as GHSA-vrrh-33qv-f36q.