CVE-2026-75828 Grav before 2.0.15 Stored XSS via detectXss() Quote Bypass
Authenticated editors can inject malicious scripts via unpaired quotes in Grav CMS, leading to code execution in visitor browsers.
- 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
- Available
What is CVE-2026-75828?
CVE-2026-75828 is a critical cross-site scripting vulnerability in getgrav grav, published on 18 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Grav before 2.0.15 contains a stored cross-site scripting vulnerability in the detectXss() function where unpaired quotes in unquoted attribute values bypass event-handler detection. Authenticated editors can inject event handlers like onerror= that pass validation and execute in visitor browsers when page content is rendered.
Weakness: CWE-79
Which versions are affected by CVE-2026-75828?
2 open source packages ship an affected version, including getgrav/grav.
| Package | Affected | Fixed in |
|---|---|---|
getgrav/grav Packagist | All versions | 2.0.15 |
getgrav/grav Packagist | All versions | 2.0.15 |
How do I fix CVE-2026-75828?
Upgrade getgrav/grav to 2.0.15 or later.
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-2026-75828 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75828 exists.
Sources
Also known as GHSA-vfmf-q6x9-cw96.