CVE-2020-11083 Stored XSS in October
A stored XSS vulnerability in October CMS allows attackers to inject malicious scripts via markdown widgets, potentially compromising other users.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-11083?
CVE-2020-11083 is a low-severity cross-site scripting vulnerability in Octobercms October, published on 14 Jul 2020. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
In October from version 1.0.319 and before version 1.0.466, a user with access to a markdown FormWidget that stores data persistently could create a stored XSS attack against themselves and any other users with access to the generated HTML from the field. This has been fixed in 1.0.466. For users of the RainLab.Blog plugin, this has also been fixed in 1.4.1.
Weakness: CWE-79
Which versions are affected by CVE-2020-11083?
2 open source packages ship an affected version, including october/backend. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
october/backend Packagist | From 1.0.319 | 1.0.466 |
october/backend Packagist | From 1.0.319 | 1.0.466 |
Products include Octobercms October.
How do I fix CVE-2020-11083?
Upgrade october/backend to 1.0.466 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-2020-11083 being exploited?
There is no known exploitation of CVE-2020-11083 in the wild and no public exploit code.
Other vulnerabilities in Octobercms October
Sources
Also known as GHSA-w4pj-7p68-3vgv.