# 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.

- **Severity:** High 8.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N`)
- **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 available:** No
- **Published:** 26 Sep 2026
- **Updated:** 30 Sep 2026
- **Also known as:** GHSA-76r2-pr95-2295, GHSA-863q-9v8v-m9fv

## 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 (Improper Neutralization of Input During Web Page Generation)

## 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.

## Is CVE-2026-100673 being exploited?

There is no known exploitation of CVE-2026-100673 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100673 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-100673 in the wild and no public exploit code.

Affected product: getgrav grav-plugin-datamanager. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-100673/ (Markdown: https://insights.sbomify.com/CVE-2026-100673/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100673
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100673
- OSV: https://osv.dev/vulnerability/CVE-2026-100673

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-100673/
Summaries are generated and may contain mistakes; the official description above is the record.