GHSA-ccrp-c664-8p4j Cross-Site Scripting in markdown-to-jsx
Attackers can execute malicious JavaScript in user browsers via crafted markdown links, requiring an upgrade to the markdown-to-jsx library.
- 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
What is GHSA-ccrp-c664-8p4j?
GHSA-ccrp-c664-8p4j is a cross-site scripting vulnerability in markdown-to-jsx, published on 3 Sep 2020. 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
Versions of markdown-to-jsx prior to 6.11.4 are vulnerable to Cross-Site Scripting. Due to insufficient input sanitization the package may render output containing malicious JavaScript. This vulnerability can be exploited through input of links containing data or VBScript URIs and a base64-encoded payload.
Recommendation
Upgrade to version 6.11.4 or later.
Which versions are affected by GHSA-ccrp-c664-8p4j?
2 open source packages ship an affected version, including markdown-to-jsx.
| Package | Affected | Fixed in |
|---|---|---|
markdown-to-jsx npm | All versions | 6.11.4 |
markdown-to-jsx npm | All versions | 6.11.4 |
How do I fix GHSA-ccrp-c664-8p4j?
Upgrade markdown-to-jsx to 6.11.4 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is GHSA-ccrp-c664-8p4j being exploited?
There is no known exploitation of GHSA-ccrp-c664-8p4j in the wild and no public exploit code.