CVE-2021-4296 w3c Unicorn ValidatorNuMessage.java ValidatorNuMessage cross site scripting
Remote attackers can inject malicious scripts via the ValidatorNuMessage function in W3C Unicorn, potentially executing code in user browsers.
- 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-2021-4296?
CVE-2021-4296 is a low-severity cross-site scripting vulnerability in w3c Unicorn, published on 29 Dec 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A vulnerability, which was classified as problematic, has been found in w3c Unicorn. This issue affects the function ValidatorNuMessage of the file src/org/w3c/unicorn/response/impl/ValidatorNuMessage.java. The manipulation of the argument message leads to cross site scripting. The attack may be initiated remotely. The name of the patch is 51f75c31f7fc33859a9a571311c67ae4e95d9c68. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-217019.
Weakness: CWE-79
Which versions are affected by CVE-2021-4296?
It affects 1 product.
Products include W3 Unicorn.
How do I fix CVE-2021-4296?
No fix has been published for CVE-2021-4296 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-2021-4296 being exploited?
There is no known exploitation of CVE-2021-4296 in the wild and no public exploit code.
Sources
Also known as GHSA-9cgm-gf5x-jx5x.