CVE-2020-21246 YiiCMS Cross Site Scripting vulnerability
A remote attacker can execute arbitrary code via a Cross-Site Scripting vulnerability in the news function of YiiCMS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-21246?
CVE-2020-21246 is a medium-severity cross-site scripting vulnerability in n/a, published on 20 Jun 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Cross Site Scripting vulnerability in YiiCMS v.1.0 allows a remote attacker to execute arbitrary code via the news function.
Weakness: CWE-79
Which versions are affected by CVE-2020-21246?
2 open source packages ship an affected version, including sheng/yiicms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
sheng/yiicms Packagist | All versions | 1.2.1 |
sheng/yiicms Packagist | All versions | 1.2.1 |
Products include Yiicms Project Yiicms.
How do I fix CVE-2020-21246?
Upgrade sheng/yiicms to 1.2.1 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-2020-21246 being exploited?
There is no known exploitation of CVE-2020-21246 in the wild and no public exploit code.
Sources
Also known as GHSA-gqr4-cvf4-3957.