# CVE-2021-32855: vditor vulnerable to Cross-site Scripting

> An attacker can execute arbitrary scripts in a victim's browser by tricking them into pasting malicious content into the Vditor Markdown editor.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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:** Yes
- **Published:** 20 Feb 2023
- **Updated:** 10 Mar 2025
- **Also known as:** GHSA-vfmp-9999-6wqj

## What is CVE-2021-32855?

CVE-2021-32855 is a medium-severity cross-site scripting vulnerability in npm vditor, published on 20 Feb 2023. 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

Vditor is a browser-side Markdown editor. Versions prior to 3.8.7 are vulnerable to copy-paste cross-site scripting (XSS). For this particular type of XSS, the victim needs to be fooled into copying a malicious payload into the text editor. Version 3.8.7 contains a patch for this issue.

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

## Which versions are affected by CVE-2021-32855?

2 open source packages ship an affected version, including vditor. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `vditor` | npm | All versions | 3.8.7 |
| `vditor` | npm | All versions | 3.8.7 |

Products: B3log Vditor.

## How do I fix CVE-2021-32855?

Upgrade vditor to 3.8.7 or later.

## Is CVE-2021-32855 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-32855 exists.

## Other vulnerabilities in npm vditor

- [CVE-2021-4103](https://insights.sbomify.com/CVE-2021-4103/): Cross-site Scripting (XSS) - Stored in vanessa219/vditor (medium 6.8)
- [CVE-2022-0341](https://insights.sbomify.com/CVE-2022-0341/): Cross-site Scripting (XSS) - Stored in vanessa219/vditor (medium 6.6)
- [CVE-2024-34449](https://insights.sbomify.com/CVE-2024-34449/): Vditor allows Cross-site Scripting via an attribute of an `A` element (medium 6.1)
- [CVE-2022-0350](https://insights.sbomify.com/CVE-2022-0350/): Cross-site Scripting (XSS) - Stored in vanessa219/vditor (medium 6.1)
- [CVE-2024-39150](https://insights.sbomify.com/CVE-2024-39150/): Path traversal in n/a (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32855 and fix it if it is affected.

What it is: CVE-2021-32855 is a medium-severity cross-site scripting vulnerability in npm vditor, published on 20 Feb 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-32855 exists.

Affected packages and fixed versions:
- vditor (npm): affected all versions; fixed in 3.8.7
- vditor (npm): affected all versions; fixed in 3.8.7

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-2021-32855/ (Markdown: https://insights.sbomify.com/CVE-2021-32855/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32855
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32855
- OSV: https://osv.dev/vulnerability/CVE-2021-32855

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32855/
Summaries are generated and may contain mistakes; the official description above is the record.