CVE-2021-24503 Popular Brand SVG Icons - Simple Icons < 2.7.8 - Contributor+ Stored XSS
Contributors can inject malicious scripts via shortcode parameters, leading to stored XSS when posts are viewed.
- 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
- None listed
What is CVE-2021-24503?
CVE-2021-24503 is a medium-severity cross-site scripting vulnerability in Unknown Popular Brand Icons – Simple Icons, published on 2 Aug 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
The Popular Brand Icons – Simple Icons WordPress plugin before 2.7.8 does not sanitise or validate some of its shortcode parameters, such as "color", "size" or "class", allowing users with a role as low as Contributor to set Cross-Site payload in them. A post made by a contributor would still have to be approved by an admin to have the XSS triggered in the frontend, however, higher privilege users, such as editor could exploit this without the need of approval, and even when the blog disallows the unfiltered_html capability.
Weakness: CWE-79
Which versions are affected by CVE-2021-24503?
It affects 1 product.
Products include Thememason Popular Brand Icons - Simple Icons.
How do I fix CVE-2021-24503?
No fix has been published for CVE-2021-24503 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 CVE-2021-24503 being exploited?
There is no known exploitation of CVE-2021-24503 in the wild and no public exploit code.
Sources
Also known as GHSA-25qm-8qm2-g8hh.