Missing Authorization Vulnerability in Wikimedia Foundation MediaWiki CampaignEvents Extension
CVE-2026-0817

5.3MEDIUM

Key Information:

Vendor

Wikimedia Foundation

Status
Mediawiki - Campaignevents Extension
Vendor
CVE Published:
9 January 2026

What is CVE-2026-0817?

The MediaWiki CampaignEvents extension, developed by the Wikimedia Foundation, is affected by a missing authorization vulnerability that allows for privilege escalation. This flaw could enable unauthorized users to exploit the system and access restricted functionalities. The issue impacts versions 1.39 through 1.45 of the extension, making it crucial for users to apply necessary patches to mitigate potential risks.

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Affected Version(s)

MediaWiki - CampaignEvents extension 1.45

MediaWiki - CampaignEvents extension 1.44

MediaWiki - CampaignEvents extension 1.43

References

https://phabricator.wikimedia.org/T410560
https://gerrit.wikimedia.org/r/q/I7ed0049691258c8bd2555e5...

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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