CVE-2026-0817: Wikimedia Campaignevents

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Missing Authorization vulnerability in Wikimedia Foundation MediaWiki - CampaignEvents extension allows Privilege Abuse.This issue affects MediaWiki - CampaignEvents extension: 1.45, 1.44, 1.43, 1.39.

Affected products

• Wikimedia Campaignevents: version 1.39 only; version 1.43 only; version 1.44 only; version 1.45 only

Published 2026-01-09. Last modified 2026-06-17.