# CVE-2026-18986: Entity Browser - Moderately critical - Cross site scripting - SA-CONTRIB-2026-094

> Attackers can inject malicious scripts via stored XSS in Drupal Entity Browser, potentially compromising user sessions and site integrity.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 2 Sep 2026
- **Updated:** 2 Sep 2026
- **Also known as:** DRUPAL-CONTRIB-2026-094, GHSA-h52g-f94f-r87h

## What is CVE-2026-18986?

CVE-2026-18986 is a medium-severity cross-site scripting vulnerability in Drupal Entity Browser, published on 2 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Entity Browser allows Stored XSS. This issue affects Entity Browser versions: from 0.0.0 to 2.16.0.

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

## Which versions are affected by CVE-2026-18986?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `drupal/entity_browser` | Packagist:https://packages.drupal.org/8 | All versions | 2.16.0 |

Products: Entity Browser Project Entity Browser.

## How do I fix CVE-2026-18986?

Upgrade to a fixed version.

## Is CVE-2026-18986 being exploited?

There is no known exploitation of CVE-2026-18986 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-18986 and fix it if it is affected.

What it is: CVE-2026-18986 is a medium-severity cross-site scripting vulnerability in Drupal Entity Browser, published on 2 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-18986 in the wild and no public exploit code.

Affected product: Drupal Entity Browser. 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-2026-18986/ (Markdown: https://insights.sbomify.com/CVE-2026-18986/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-18986
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18986
- OSV: https://osv.dev/vulnerability/CVE-2026-18986

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-18986/
Summaries are generated and may contain mistakes; the official description above is the record.