CVE-2021-40542 Cross-site scripting in n/a
An unauthenticated attacker can inject and execute JavaScript code via the link_url parameter in Ajax_url_encode.php.
- 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
- None listed
What is CVE-2021-40542?
CVE-2021-40542 is a medium-severity cross-site scripting vulnerability in Os4ed Opensis, published on 11 Oct 2021. 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
Opensis-Classic Version 8.0 is affected by cross-site scripting (XSS). An unauthenticated user can inject and execute JavaScript code through the link_url parameter in Ajax_url_encode.php.
Weakness: CWE-79
Which versions are affected by CVE-2021-40542?
It affects 1 product.
Products include Os4ed Opensis.
How do I fix CVE-2021-40542?
No fix has been published for CVE-2021-40542 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-2021-40542 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-40542 exists.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in Os4ed Opensis
Sources
Also known as GHSA-88f6-r22m-fxmf.