CVE-2026-3554 Cross-site scripting in Sherk Custom Post Type Displays
Authenticated attackers can inject arbitrary scripts via the title shortcode attribute, leading to stored XSS execution on victim pages.
- 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-2026-3554?
CVE-2026-3554 is a medium-severity cross-site scripting vulnerability in sherkspear Sherk Custom Post Type Displays, published on 21 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Sherk Custom Post Type Displays plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title' shortcode attribute in all versions up to, and including, 1.2.1. This is due to insufficient input sanitization and output escaping on the 'title' attribute of the 'sherkcptdisplays' shortcode. Specifically, in the sherkcptdisplays_func() function in includes/SherkCPTDisplaysShortcode.php, the 'title' attribute value is extracted from shortcode_atts() on line 19 and directly concatenated into an HTML <h2> tag on line 31 without any escaping. 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-3554?
How do I fix CVE-2026-3554?
No fix has been published for CVE-2026-3554 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-2026-3554 being exploited?
There is no known exploitation of CVE-2026-3554 in the wild and no public exploit code.
Sources
Also known as GHSA-x8x7-xgj7-47r4.