# CVE-2026-4093: Stored XSS in Drupal 7 Term Reference Tree module (token display templates and term labels)

> Stored XSS in Drupal Term Reference Tree allows attackers to inject scripts via term labels or token templates, potentially leading to session hijacking.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 21 May 2026
- **Updated:** 22 May 2026
- **Also known as:** CLSA-2026-1789375926, GHSA-q6w2-7g3j-5vg3

## What is CVE-2026-4093?

CVE-2026-4093 is a medium-severity cross-site scripting vulnerability in Drupal Term Reference Tree, published on 21 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

In the Drupal 7 Term Reference Tree module, two stored XSS vectors exist in the widget/formatter rendering pipeline.

Vector A (token display templates): When the Token module is enabled and token display templates are configured, attacker-controlled token output (e.g., term description) is rendered without proper sanitization. Any user who can edit the referenced taxonomy terms can inject HTML/JS that executes when the field is rendered.

Vector B (term label rendering): Taxonomy term labels are not properly sanitized before being rendered in the widget, allowing a user with permission to create or edit taxonomy terms to inject scripts into the term name that execute when a form containing the widget is viewed.

Exploit affects versions 7.x-1.x up to and including 7.x-1.11.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-4093?

It affects 1 product.


Products: Taxonomy Term Reference Tree Widget Project Taxonomy Term Reference Tree Widget.

## How do I fix CVE-2026-4093?

Apply the vendor's patch.

## Is CVE-2026-4093 being exploited?

There is no known exploitation of CVE-2026-4093 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4093 and fix it if it is affected.

What it is: CVE-2026-4093 is a medium-severity cross-site scripting vulnerability in Drupal Term Reference Tree, published on 21 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-4093 in the wild and no public exploit code.

Affected product: Drupal Term Reference Tree. 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-2026-4093/ (Markdown: https://insights.sbomify.com/CVE-2026-4093/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4093
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4093
- OSV: https://osv.dev/vulnerability/CVE-2026-4093

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4093/
Summaries are generated and may contain mistakes; the official description above is the record.