CVE-2020-35478 Cross-site scripting in n/a

What is CVE-2020-35478?

CVE-2020-35478 is a medium-severity cross-site scripting vulnerability in Fedoraproject Fedora, published on 18 Dec 2020. 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

MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. MediaWiki:blanknamespace potentially can be output as raw HTML with SCRIPT tags via LogFormatter::makePageLink(). This affects MediaWiki 1.33.0 and later.

Weakness: CWE-79

Which versions are affected by CVE-2020-35478?

1 open source package ship an affected version, including mediawiki. It affects 2 products.

Products include Fedoraproject Fedora, Mediawiki Mediawiki.

How do I fix CVE-2020-35478?

Upgrade mediawiki to 1.35.1 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-2020-35478 being exploited?

There is no known exploitation of CVE-2020-35478 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 BIT-mediawiki-2020-35478, DEBIAN-CVE-2020-35478, GHSA-xcc7-h9w8-fh42, UBUNTU-CVE-2020-35478.