CVE-2017-20239 MDwiki Cross-Site Scripting via Location Hash Parameter
Remote attackers can execute arbitrary JavaScript in victims' browsers by injecting malicious code into the location hash parameter of MDwiki.
- 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-2017-20239?
CVE-2017-20239 is a medium-severity cross-site scripting vulnerability in Dynalon MDwiki, published on 12 Apr 2026. 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
MDwiki contains a cross-site scripting vulnerability that allows remote attackers to execute arbitrary JavaScript by injecting malicious code through the location hash parameter. Attackers can craft URLs with JavaScript payloads in the hash fragment that are parsed and rendered without sanitization, causing the injected scripts to execute in the victim's browser context.
Weakness: CWE-79
Which versions are affected by CVE-2017-20239?
It affects 1 product.
Products include Dynalon Mdwiki.
How do I fix CVE-2017-20239?
No fix has been published for CVE-2017-20239 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-2017-20239 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20239 exists.
Sources
Also known as GHSA-gp82-mmj7-m5w2.