CVE-2026-2021 Cross-site scripting in Slideshow Gallery LITE
Authenticated attackers can inject arbitrary web scripts via the 'alwaysauto' shortcode attribute in Slideshow Gallery LITE, affecting WordPress users.
- 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-2026-2021?
CVE-2026-2021 is a medium-severity cross-site scripting vulnerability in contrid Slideshow Gallery LITE, published on 18 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Slideshow Gallery LITE plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'alwaysauto' shortcode attribute in all versions up to, and including, 1.8.5. This is due to insufficient input sanitization and output escaping on user-supplied attributes. 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-2026-2021?
How do I fix CVE-2026-2021?
No fix has been published for CVE-2026-2021 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-2026-2021 being exploited?
There is no known exploitation of CVE-2026-2021 in the wild and no public exploit code.
Sources
Also known as GHSA-5qqr-q6rw-943w.