CVE-2017-8814 Cross-site scripting in MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2

What is CVE-2017-8814?

CVE-2017-8814 is a high-severity cross-site scripting vulnerability in Debian Debian Linux, published on 15 Nov 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The language converter in MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows attackers to replace text inside tags via a rule definition followed by "a lot of junk."

Weakness: CWE-20

Which versions are affected by CVE-2017-8814?

It affects 2 products.

Products include Debian Debian Linux, Mediawiki Mediawiki.

How do I fix CVE-2017-8814?

Upgrade to a fixed version.

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-2017-8814 being exploited?

There is no known exploitation of CVE-2017-8814 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2017-8814, GHSA-x2m4-j2wv-q4h4.