CVE-2026-100673 Grav Data Manager before 1.4.5 Stored XSS via item-detail view
An unauthenticated attacker can store malicious HTML in form submissions that executes as JavaScript in an administrator's session, leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-100673?
CVE-2026-100673 is a high-severity cross-site scripting vulnerability in getgrav grav-plugin-datamanager, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The Grav Data Manager plugin (getgrav/grav-plugin-datamanager) versions 1.0.1 through 1.4.4 render stored data entries in the item-detail view (admin/templates/partials/item.html.twig) without escaping, applying Twig's `raw` filter — in some cases after a striptags('<br>') call that PHP's strip_tags() bypasses by preserving allowed tags together with their attributes. An unauthenticated visitor who submits a front-end form whose submissions are saved to user/data can store an HTML payload that executes as JavaScript in the session and origin of an administrator who later opens that entry in the classic admin panel, running with that administrator's privileges and CSRF token. Execution occurs without further interaction for list values (such as checkbox or multi-select fields) and on hover for ordinary text fields. Sites using the Grav 2.0 Admin Next interface are not affected, because it renders the same data through a separate, correctly escaping code path. The issue is fixed in Data Manager 1.4.5.
Weakness: CWE-79
Which versions are affected by CVE-2026-100673?
How do I fix CVE-2026-100673?
No fix has been published for CVE-2026-100673 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-2026-100673 being exploited?
There is no known exploitation of CVE-2026-100673 in the wild and no public exploit code.
Sources
Also known as GHSA-76r2-pr95-2295, GHSA-863q-9v8v-m9fv.