CVE-2021-28833 qiita-markdown Cross-site Scripting vulnerability
Attackers can execute arbitrary scripts in user browsers via crafted gist links in the Qiita::Markdown Ruby library.
- 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
- Available
What is CVE-2021-28833?
CVE-2021-28833 is a medium-severity cross-site scripting vulnerability in n/a, published on 21 Jun 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
Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.
Weakness: CWE-79
Which versions are affected by CVE-2021-28833?
2 open source packages ship an affected version, including qiita-markdown. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
qiita-markdown RubyGems | All versions | 0.34.0 |
qiita-markdown RubyGems | All versions | 0.34.0 |
Products include Increments Qiita\.
How do I fix CVE-2021-28833?
Upgrade qiita-markdown to 0.34.0 or later.
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-2021-28833 being exploited?
There is no known exploitation of CVE-2021-28833 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-9p29-94hp-8rvc.