CVE-2025-27826 Cross-site scripting in Bootstrap Lite theme
An attacker can inject malicious scripts via unsanitized class names in the Bootstrap Lite theme for Backdrop CMS.
- 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-2025-27826?
CVE-2025-27826 is a medium-severity cross-site scripting vulnerability in backdropcms Bootstrap Lite theme, published on 7 Mar 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An XSS issue was discovered in the Bootstrap Lite theme before 1.x-1.4.5 for Backdrop CMS. It doesn't sufficiently sanitize certain class names.
Weakness: CWE-79
Which versions are affected by CVE-2025-27826?
How do I fix CVE-2025-27826?
No fix has been published for CVE-2025-27826 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-2025-27826 being exploited?
There is no known exploitation of CVE-2025-27826 in the wild and no public exploit code.
Sources
Also known as GHSA-8ffh-fmcj-65vx.