CVE-2017-16876 mistune Cross-site scripting (XSS) vulnerability

What is CVE-2017-16876?

CVE-2017-16876 is a medium-severity cross-site scripting vulnerability in Fedoraproject Fedora, published on 29 Dec 2017. 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 (XSS) vulnerability in the _keyify function in mistune.py in Mistune before 0.8.1 allows remote attackers to inject arbitrary web script or HTML by leveraging failure to escape the "key" argument.

Weakness: CWE-79

Which versions are affected by CVE-2017-16876?

3 open source packages ship an affected version, including mistune. It affects 2 products.

Products include Fedoraproject Fedora, Mistune Project Mistune.

How do I fix CVE-2017-16876?

Upgrade mistune to 0.8.1 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-2017-16876 being exploited?

There is no known exploitation of CVE-2017-16876 in the wild and no public exploit code.

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• 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 DEBIAN-CVE-2017-16876, GHSA-98gj-wwxm-cj3h, PYSEC-2017-18, UBUNTU-CVE-2017-16876.