# CVE-2020-11051: XSS in Wiki.js

> Stored XSS in Wiki.js Markdown editor allows attackers to execute scripts in other editors' preview panels.

- **Severity:** Medium 6.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/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:** No
- **Published:** 5 May 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-vj72-c9vq-qxrv

## What is CVE-2020-11051?

CVE-2020-11051 is a medium-severity cross-site scripting vulnerability in Requarks Wiki.js, published on 5 May 2020. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

In Wiki.js before 2.3.81, there is a stored XSS in the Markdown editor. An editor with write access to a page, using the Markdown editor, could inject an XSS payload into the content. If another editor (with write access as well) load the same page into the Markdown editor, the XSS payload will be executed as part of the preview panel. The rendered result does not contain the XSS payload as it is stripped by the HTML Sanitization security module. This vulnerability only impacts editors loading the malicious page in the Markdown editor. This has been patched in 2.3.81.

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

## Which versions are affected by CVE-2020-11051?

It affects 1 product.


Products: Requarks Wiki.js.

## How do I fix CVE-2020-11051?

No fix has been published for CVE-2020-11051 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-11051 being exploited?

There is no known exploitation of CVE-2020-11051 in the wild and no public exploit code.

## Other vulnerabilities in Requarks Wiki.js

- [CVE-2025-56643](https://insights.sbomify.com/CVE-2025-56643/): Security feature bypass in n/a (critical 9.1)
- [CVE-2026-44224](https://insights.sbomify.com/CVE-2026-44224/): Wiki.js: Privilege Escalation via Missing Group Validation in users.update (high 8.6)
- [CVE-2020-15236](https://insights.sbomify.com/CVE-2020-15236/): Directory Traversal in Wiki.js (high 8.6)
- [CVE-2021-43855](https://insights.sbomify.com/CVE-2021-43855/): Stored XSS via SVG in Requarks/wiki (high 8.2)
- [CVE-2021-43856](https://insights.sbomify.com/CVE-2021-43856/): Stored XSS in non-image uploads in Requarks/wiki (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-11051 and fix it if it is affected.

What it is: CVE-2020-11051 is a medium-severity cross-site scripting vulnerability in Requarks Wiki.js, published on 5 May 2020. 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-2020-11051 in the wild and no public exploit code.

Affected product: Requarks Wiki.js. 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-2020-11051/ (Markdown: https://insights.sbomify.com/CVE-2020-11051/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-11051
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-11051
- OSV: https://osv.dev/vulnerability/CVE-2020-11051

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-11051/
Summaries are generated and may contain mistakes; the official description above is the record.