CVE-2026-17586 Cross-site scripting in VK All in One Expansion Unit
Authenticated attackers with contributor access can inject arbitrary scripts via post meta, 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-2026-17586?
CVE-2026-17586 is a medium-severity cross-site scripting vulnerability in kurudrive VK All in One Expansion Unit, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The VK All in One Expansion Unit plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'vkExUnit_cta_img_position' Post Meta in all versions up to, and including, 9.118.0 due to insufficient input sanitization and output 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. The sanitize_text_field callback applied on save does not strip double-quote characters or on* event-handler attributes, and the output filter Vk_Call_To_Action::safe_kses_post() only rewrites disallowed iframe elements while returning all other content verbatim, leaving the injected payload intact in the rendered HTML.
Weakness: CWE-79
Which versions are affected by CVE-2026-17586?
How do I fix CVE-2026-17586?
No fix has been published for CVE-2026-17586 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-2026-17586 being exploited?
There is no known exploitation of CVE-2026-17586 in the wild and no public exploit code.
Sources
Also known as GHSA-738x-57qm-fc2r.