Vulnerability · Published May 11, 2026 · Assigned by GitHub_M
CVE-2026-42842grav-plugin-form: XSS via Taxonomy Field Values in Admin Panel
Medium 5.4
In plain English
A medium-severity cross-site scripting in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
The form plugin for Grav adds the ability to create and use forms. Prior to 9.1.0, a Stored Cross-Site Scripting (XSS) vulnerability exists in the Grav CMS Form plugin's select field template. Taxonomy tag and category values are rendered with the Twig |raw filter in the admin panel, bypassing the global autoescape protection. An editor-level user can inject arbitrary JavaScript that executes in any administrator's browser session when they view or edit any page in the admin panel. This vulnerability is fixed in 9.1.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | getgrav/grav | 2.0.0-beta.2 | GHSA-c2q3-p4jr-c55f |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| getgrav | grav | < 2.0.0-beta.2 |
| getgrav | grav-plugin-form | < 9.1.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N