CVE-2026-42841
Medium
Description
Grav is a file-based Web platform. Prior to 2.0.0-beta.2, an authenticated user with page editing permissions can inject an executable JavaScript event-handler attribute into rendered image HTML through Grav's Markdown media action syntax. The issue is caused by Markdown image query parameters being converted into callable media actions. The public attribute() media method can be reached this way, allowing an editor to set an arbitrary HTML attribute name and value on the generated image element. This vulnerability is fixed in 2.0.0-beta.2.
SeverityMedium
CVSS4.8
Exploit probability—
Product
Grav
PublishedMay 11, 2026
First seenMay 11, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- getgrav/grav2.0.0-beta.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| getgrav grav | v ≤ 1.8.0, 2.0.0 | — |
| getgrav/gravPackagist | v < 2.0.0-beta.2 | 2.0.0-beta.2 |
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