CVE-2019-9844 Cross-Site Scripting in simple-markdown

What is CVE-2019-9844?

CVE-2019-9844 is a medium-severity cross-site scripting vulnerability in Fedoraproject Fedora, published on 15 Mar 2019. 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

simple-markdown.js in Khan Academy simple-markdown before 0.4.4 allows XSS via a data: or vbscript: URI.

Weakness: CWE-79

Which versions are affected by CVE-2019-9844?

2 open source packages ship an affected version, including simple-markdown. It affects 2 products.

Products include Fedoraproject Fedora, Khanacademy Simple-Markdown.

How do I fix CVE-2019-9844?

Upgrade simple-markdown to 0.4.4 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-2019-9844 being exploited?

There is no known exploitation of CVE-2019-9844 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qj3f-9gmq-fwv5.