GHSA-5ff8-jcf9-fw62 Cross-Site Scripting in markdown-it-katex
Attackers can execute arbitrary JavaScript in victims' browsers via unescaped error messages in the markdown-it-katex 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
- None listed
What is GHSA-5ff8-jcf9-fw62?
GHSA-5ff8-jcf9-fw62 is a cross-site scripting vulnerability in markdown-it-katex, published on 4 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
All versions of markdown-it-katex are vulnerable to Cross-Site Scripting (XSS). The package fails to properly escape error messages, which may allow attackers to execute arbitrary JavaScript in a victim's browser by triggering an error.
Recommendation
No fix is currently available. Consider using an alternative package until a fix is made available.
Which versions are affected by GHSA-5ff8-jcf9-fw62?
2 open source packages ship an affected version, including markdown-it-katex.
| Package | Affected | Fixed in |
|---|---|---|
markdown-it-katex npm | From 0.0.0 | None |
markdown-it-katex npm | From 0.0.0 | None |
How do I fix GHSA-5ff8-jcf9-fw62?
No fix has been published for GHSA-5ff8-jcf9-fw62 yet. Limit exposure of the affected software until one is available.
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-5ff8-jcf9-fw62 being exploited?
There is no known exploitation of GHSA-5ff8-jcf9-fw62 in the wild and no public exploit code.