CVE-2026-9635: WP Shortcode by MyThemeShop <= 1.4.17 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'title' Shortcode Attribute
The WP Shortcode by MyThemeShop plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title' parameter of the [tab] shortcode in versions up to, and including, 1.4.17. This is due to insufficient input sanitization and output escaping in the mtstabs() function, which outputs the title shortcode attribute directly into the HTML output between anchor tags without applying any escaping functions. 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 accesses an injected page.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
WordPress plugin: WP Shortcode by MyThemeShopto a version that resolves this vulnerability.Fixed in 1.4.17 - Configuration
Do not render the [tab] shortcode's 'title' attribute directly into the HTML between anchor tags; ensure the 'title' parameter is properly sanitized and output-escaped in mts_tabs() before inserting into the page.
WordPress plugin: WP Shortcode by MyThemeShop [tab] shortcode title parameter output handling = Escaped/sanitized before rendering into HTML anchor content
Event History
Frequently Asked Questions
What is the severity of CVE-2026-9635?
CVE-2026-9635 has a medium severity score of 6.4.
How do I fix CVE-2026-9635?
To fix CVE-2026-9635, update the WP Shortcode by MyThemeShop plugin to version 1.4.18 or later.
What type of vulnerability is CVE-2026-9635?
CVE-2026-9635 is a Stored Cross-Site Scripting (XSS) vulnerability.
Who is affected by CVE-2026-9635?
Users of the WP Shortcode by MyThemeShop plugin versions up to and including 1.4.17 are affected by CVE-2026-9635.
What causes CVE-2026-9635?
CVE-2026-9635 is caused by insufficient input sanitization and output escaping in the mts_tabs() function.