CVE-2023-53976 myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management
Authenticated administrators can inject malicious scripts via template titles, leading to arbitrary JavaScript execution when viewed.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-53976?
CVE-2023-53976 is a medium-severity cross-site scripting vulnerability in Mybb Mybb, published on 22 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the template management system that allows authenticated administrators to inject malicious scripts when creating new templates. Attackers can exploit this vulnerability by inserting script payloads in the template title field when adding new templates through the 'Templates and Style' > 'Templates' > 'Manage Templates' > 'Global Templates' interface, causing arbitrary JavaScript to execute when the template is viewed.
Weakness: CWE-79
Which versions are affected by CVE-2023-53976?
It affects 1 product.
Products include Mybb Mybb.
How do I fix CVE-2023-53976?
No fix has been published for CVE-2023-53976 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-2023-53976 being exploited?
There is no known exploitation of CVE-2023-53976 in the wild and no public exploit code.
Other vulnerabilities in Mybb Mybb
Sources
Also known as GHSA-wf3v-cq62-6r54.