CVE-2020-35480 Information disclosure in n/a

What is CVE-2020-35480?

CVE-2020-35480 is a medium-severity vulnerability in Debian Debian Linux, published on 18 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in MediaWiki before 1.35.1. Missing users (accounts that don't exist) and hidden users (accounts that have been explicitly hidden due to being abusive, or similar) that the viewer cannot see are handled differently, exposing sensitive information about the hidden status to unprivileged viewers. This exists on various code paths.

Weakness: CWE-203

Which versions are affected by CVE-2020-35480?

1 open source package ship an affected version, including mediawiki. It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Mediawiki Mediawiki.

How do I fix CVE-2020-35480?

Upgrade mediawiki to 1.35.1 or later.

Is CVE-2020-35480 being exploited?

There is no known exploitation of CVE-2020-35480 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 BIT-mediawiki-2020-35480, DEBIAN-CVE-2020-35480, GHSA-6wfj-pw33-8cr3, UBUNTU-CVE-2020-35480.