CVE-2020-8127 Cross-site Scripting in reveal.js
Attackers can execute arbitrary scripts in the context of users viewing presentations due to insufficient validation in postMessage handling.
- 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 CVE-2020-8127?
CVE-2020-8127 is a medium-severity cross-site scripting vulnerability in reveal.js, published on 28 Feb 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
Insufficient validation in cross-origin communication (postMessage) in reveal.js version 3.9.1 and earlier allow attackers to perform cross-site scripting attacks.
Weakness: CWE-79
Which versions are affected by CVE-2020-8127?
2 open source packages ship an affected version, including reveal.js. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
reveal.js npm | All versions | 3.9.2 |
reveal.js npm | All versions | 3.9.2 |
Products include Revealjs Reveal.js.
How do I fix CVE-2020-8127?
Upgrade reveal.js to 3.9.2 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 CVE-2020-8127 being exploited?
There is no known exploitation of CVE-2020-8127 in the wild and no public exploit code.
Other vulnerabilities in reveal.js
Sources
Also known as GHSA-6vwx-mwp8-fh44.