CVE-2021-40104 Cross-site scripting in n/a
Attackers can bypass SVG sanitization in Concrete CMS to inject malicious scripts, potentially leading to code execution or session hijacking.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-40104?
CVE-2021-40104 is a high-severity cross-site scripting vulnerability in Concretecms Concrete Cms, published on 27 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
Which versions are affected by CVE-2021-40104?
It affects 1 product.
Products include Concretecms Concrete Cms.
How do I fix CVE-2021-40104?
No fix has been published for CVE-2021-40104 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-2021-40104 being exploited?
There is no known exploitation of CVE-2021-40104 in the wild and no public exploit code.
Other vulnerabilities in Concretecms Concrete Cms
- CVE-2023-48648 Concrete CMS allows unauthorized access because directories can be created with insecure permissions
- CVE-2022-21829 Code injection in concrete CMS
- CVE-2021-22958 Server-Side Request Forgery vulnerability in concrete5
- CVE-2021-40098 Path traversal in n/a
- CVE-2026-8134 Concrete CMS Vulnerable to Relative Path Traversal
Sources
Also known as GHSA-jh36-7vgg-mwm2.