What’s Vulnerable › Vulnerabilities

CVE-2026-42842: grav-plugin-form: XSS via Taxonomy Field Values in Admin Panel

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-11 · updated 2026-10-26
• Weakness: CWE-79

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 products

• getgrav grav: before 2.0.0-beta.2
• getgrav grav-plugin-form: before 9.1.0

References

• https://github.com/getgrav/grav-plugin-form/commit/6bffb4c98be468a155d1656544ec45bb4a443957
• https://github.com/getgrav/grav/security/advisories/GHSA-c2q3-p4jr-c55f
• https://github.com/getgrav/grav/security/advisories/GHSA-c2q3-p4jr-c55f

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