CVE-2021-20727 Cross-site scripting in Zettlr
An attacker can execute arbitrary scripts in Zettlr by loading a file with a malicious iframe, potentially compromising the user's environment.
- 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-2021-20727?
CVE-2021-20727 is a medium-severity cross-site scripting vulnerability in Hendrik Erz Zettlr, published on 27 May 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
Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary script by loading a file or code snippet containing an invalid iframe into Zettlr.
Weakness: CWE-79
Which versions are affected by CVE-2021-20727?
It affects 1 product.
Products include Zettlr Zettlr.
How do I fix CVE-2021-20727?
No fix has been published for CVE-2021-20727 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-2021-20727 being exploited?
There is no known exploitation of CVE-2021-20727 in the wild and no public exploit code.
Other vulnerabilities in Hendrik Erz Zettlr
Sources
Also known as GHSA-vwf2-95mj-6g95.