CVE-2026-107757 Cross-site scripting in Gallery Custom Links
Authenticated attackers can inject arbitrary scripts via display names and comments, leading to stored XSS execution for other 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-2026-107757?
CVE-2026-107757 is a medium-severity cross-site scripting vulnerability in tigroumeow Gallery Custom Links, published on 14 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Gallery Custom Links plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'display_name (profile.php) + comment (wp-comments-post.php)' parameter in all versions up to, and including, 2.3.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit requires two coordinated inputs from the same authenticated attacker: an HTML comment payload stored in a comment body (preserved verbatim by WordPress comment kses) and a matching simple_html_dom noise key placed in the attacker's display_name (which survives esc_attr() intact), with substitution occurring after both filters have run during the plugin's default-on output-buffering pass over the full rendered page.
Weakness: CWE-79
Which versions are affected by CVE-2026-107757?
How do I fix CVE-2026-107757?
No fix has been published for CVE-2026-107757 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-2026-107757 being exploited?
There is no known exploitation of CVE-2026-107757 in the wild and no public exploit code.
Sources
Also known as GHSA-cq73-4rhf-ggqc.