Cross-site Scripting (XSS) Affecting mediawiki package, versions <1:1.35.5-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.57% (46th percentile)

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  • Snyk IDSNYK-ECHOLATEST-MEDIAWIKI-20414320
  • published3 Oct 2026
  • disclosed26 Dec 2022

Introduced: 26 Dec 2022

CVE-2021-44855  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Echo:latest mediawiki to version 1:1.35.5-1 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 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. There is Blind Stored XSS via a URL to the Upload Image feature.

CVSS Base Scores

version 3.1