Medium 5.3Published Jan 9, 2026

CVE-2026-0817CampaignEvents API missing authorization exposes meeting and chat URLs

Updated under an hour ago (Oct 26, 2026, 6:10 PM ET)

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It affects Wikimedia Foundation MediaWiki - CampaignEvents extension and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Wikimedia Foundation MediaWiki - CampaignEvents extension

Exploited in the last 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.

CVSS: 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: wikimedia-foundation
NVD analysis: Analyzed
Record last updated: Jan 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Wikimedia Foundation MediaWiki - CampaignEvents extension wikimedia_foundation:mediawiki_campaignevents_extension (from the name)	1.45; 1.44; 1.43; 1.39	CNA record
wikimedia campaignevents wikimedia:campaignevents	1.39; 1.43; 1.44; 1.45	NVD

References

References

https://phabricator.wikimedia.org/T410560	issue-tracking
https://gerrit.wikimedia.org/r/q/I7ed0049691258c8bd2555e599b9b88490fbe3358	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.