Information Exposure Affecting mediawiki package, versions <1:1.35.1-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
1.49% (74th percentile)

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  • Snyk IDSNYK-ECHOLATEST-MEDIAWIKI-20414301
  • published3 Oct 2026
  • disclosed18 Dec 2020

Introduced: 18 Dec 2020

CVE-2020-35480  (opens in a new tab)
CWE-203  (opens in a new tab)

How to fix?

Upgrade Echo:latest mediawiki to version 1:1.35.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mediawiki package and not the mediawiki package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1