# DRUPAL-CORE-2021-011: The Drupal project uses the [CKEditor](https://github.com/ckeditor/ckeditor4) library for WYSIWYG editing. > Attackers with content creation rights can exploit XSS in CKEditor to target privileged users, potentially leading to account takeover. - **Severity:** Not scored - **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:** 17 Nov 2021 ## What is DRUPAL-CORE-2021-011? DRUPAL-CORE-2021-011 is a cross-site scripting vulnerability in drupal/core, published on 17 Nov 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link. ### Official description The Drupal project uses the [CKEditor](https://github.com/ckeditor/ckeditor4) library for WYSIWYG editing. CKEditor has released [a security update that impacts Drupal](https://ckeditor.com/cke4/release/CKEditor-4.17.0), along with a [hotfix for that update](https://ckeditor.com/cke4/release/CKEditor-4.17.1). Vulnerabilities are possible if Drupal is configured to allow use of the CKEditor library for WYSIWYG editing. An attacker that can create or edit content (even without access to CKEditor themselves) may be able to exploit one or more Cross-Site Scripting (XSS) vulnerabilities to target users with access to the WYSIWYG CKEditor, including site admins with privileged access. For more information, see CKEditor's security advisories: * [CVE-2021-41165: HTML comments vulnerability allowing to execute JavaScript code](https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-7h26-63m7-qhf2) * [CVE-2021-41164: Advanced Content Filter (ACF) vulnerability allowing to execute JavaScript code using malformed HTML](https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj) This advisory is not covered by [Drupal Steward](/steward). ## Which versions are affected by DRUPAL-CORE-2021-011? 1 open source package ship an affected version, including drupal/core. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `drupal/core` | Packagist | From 8.0.0 | 8.9.20, 9.1.14, 9.2.9 | ## How do I fix DRUPAL-CORE-2021-011? Upgrade drupal/core to a fixed version for your release line: 8.9.20, 9.1.14 or 9.2.9. ## Is DRUPAL-CORE-2021-011 being exploited? There is no known exploitation of DRUPAL-CORE-2021-011 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for DRUPAL-CORE-2021-011 and fix it if it is affected. What it is: DRUPAL-CORE-2021-011 is a cross-site scripting vulnerability in drupal/core, published on 17 Nov 2021. 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 DRUPAL-CORE-2021-011 in the wild and no public exploit code. Affected packages and fixed versions: - drupal/core (Packagist): affected from 8.0.0; fixed in 8.9.20, 9.1.14, 9.2.9 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/DRUPAL-CORE-2021-011/ (Markdown: https://insights.sbomify.com/DRUPAL-CORE-2021-011/index.md) ``` ## Sources - OSV: https://osv.dev/vulnerability/DRUPAL-CORE-2021-011 --- From sbomify Insights: https://insights.sbomify.com/DRUPAL-CORE-2021-011/ Summaries are generated and may contain mistakes; the official description above is the record.