CVE-2025-66843 Grav is vulnerable to Stored XSS through authenticated user-edited content

What is CVE-2025-66843?

CVE-2025-66843 is a medium-severity cross-site scripting vulnerability in Getgrav Grav, published on 15 Dec 2025. 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 v1.7.49.5 has a Stored Cross-Site Scripting (Stored XSS) vulnerability in the page editing functionality. An authenticated low-privileged user with permission to edit content can inject malicious JavaScript payloads into editable fields. The payload is stored on the server and later executed when any other user views or edits the affected page.

Weakness: CWE-79

Which versions are affected by CVE-2025-66843?

2 open source packages ship an affected version, including getgrav/grav. It affects 1 product.

Products include Getgrav Grav.

How do I fix CVE-2025-66843?

No fix has been published for CVE-2025-66843 yet. Limit exposure of the affected software until one is available.

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-2025-66843 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66843 exists.

Other vulnerabilities in Getgrav Grav

• CVE-2023-34251 Grav Server Side Template Injection vulnerability Critical 10.0
• CVE-2025-46199 Cross-site scripting in n/a Critical 9.8
• CVE-2021-47812 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) Critical 9.3
• CVE-2025-66844 Grav may be vulnerable to SSRF attack via Twig Templates Critical 9.1
• CVE-2022-2073 Code Injection in getgrav/grav Critical 9.1

All Getgrav Grav vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-mh85-44c2-3m97.