What’s Vulnerable › Vulnerabilities

CVE-2021-42048

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-09-29 · updated 2026-06-17
• Weakness: CWE-79

Description

An issue was discovered in the Growth extension in MediaWiki through 1.36.2. Any admin can add arbitrary JavaScript code to the Newcomer home page footer, which can be executed by viewers with zero edits.

Affected products

• Wikimedia Foundation MediaWiki: through 1.36.2

References

• https://gerrit.wikimedia.org/r/q/Iaa90a8976834d70caad592e9d1b18510318db537
• https://phabricator.wikimedia.org/T289064
• https://gerrit.wikimedia.org/r/q/Iaa90a8976834d70caad592e9d1b18510318db537
• https://phabricator.wikimedia.org/T289064

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