CVE-2026-85601: Grav Admin before 2.0.20 Cross-Site Scripting via marked.js

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-04 · updated 2026-09-10
Weakness: CWE-79

Description

Grav Admin before 2.0.20 fails to sanitize output from marked.parse() before injecting it into the DOM via Svelte's {@html} directive in MarkdownEditor and MarkdownModal components. Attackers can inject javascript: URI schemes in plugin or theme changelogs to execute arbitrary code in authenticated admin sessions without requiring site access.

Affected products

getgrav grav: before 2.0.20 — fixed in 2.0.20

How to fix

Upgrade to a fixed version: getgrav grav 2.0.20. Check the vendor advisory for mitigations.

References

https://github.com/getgrav/grav/security/advisories/GHSA-752r-88j4-vxm3
https://www.vulncheck.com/advisories/grav-admin-before-2.0.20-cross-site-scripting-via-marked-js

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