CVE-2026-8867 Post Categories Gallery <= 1.0.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
Authenticated attackers can inject arbitrary scripts via shortcode attributes in the Post Categories Gallery plugin, executing them 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-2026-8867?
CVE-2026-8867 is a medium-severity cross-site scripting vulnerability in fides-it Post Categories Gallery, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Post Category Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'postcategorygallery' shortcode in versions up to, and including, 1.0.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (such as total_width, color_scheme, and caption_font_size) inside the sc_horcatbar() function, which are concatenated directly into HTML attribute values. 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-2026-8867?
How do I fix CVE-2026-8867?
No fix has been published for CVE-2026-8867 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-2026-8867 being exploited?
There is no known exploitation of CVE-2026-8867 in the wild and no public exploit code.
Sources
Also known as GHSA-8px5-75f8-5vhw.