CVE-2026-75831 Grav before 2.0.15 Stored XSS via audio/video source URL
Attackers can inject malicious scripts via media URLs in Grav CMS, leading to arbitrary code execution in victim sessions.
- 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-2026-75831?
CVE-2026-75831 is a medium-severity 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 audio and video media rendering through the sourceParsedownElement method. The media URL fragment is concatenated unescaped into rawHtml source elements, allowing attackers to inject arbitrary HTML and JavaScript that executes in viewers' sessions.
Weakness: CWE-79
Which versions are affected by CVE-2026-75831?
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-2026-75831?
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-2026-75831 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75831 exists.
Sources
Also known as GHSA-6qw9-4vv5-jr97.