GHSA-f8rq-m28h-8hxj Cross-Site Scripting in htmr
An attacker can execute arbitrary JavaScript in a victim's browser via DOM-based XSS in the htmr library, requiring an upgrade to mitigate.
- 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-f8rq-m28h-8hxj?
GHSA-f8rq-m28h-8hxj is a cross-site scripting vulnerability in htmr, 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 htmr prior to 0.8.7 are vulnerable to Cross-Site Scripting (XSS). The package uses innerHTML to unescape HTML entities. This may lead to DOM-based XSS through HTML-encoded XSS payloads. This may allow an attacker to execute arbitrary JavaScript in a victim's browser.
Recommendation
Upgrade to version 0.8.7 or later.
Which versions are affected by GHSA-f8rq-m28h-8hxj?
2 open source packages ship an affected version, including htmr.
| Package | Affected | Fixed in |
|---|---|---|
htmr npm | All versions | 0.8.7 |
htmr npm | All versions | 0.8.7 |
How do I fix GHSA-f8rq-m28h-8hxj?
Upgrade htmr to 0.8.7 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-f8rq-m28h-8hxj being exploited?
There is no known exploitation of GHSA-f8rq-m28h-8hxj in the wild and no public exploit code.