CVE-2026-45780
Medium
Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, EventSerializer could expose invited group names, sample invitees, and attendance statistics to users who could view the topic but were not entitled to view the private event invitee list. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Discourse
PublishedJul 9, 2026
First seenJul 9, 2026
Weakness typeCWE-200Sensitive information exposure
How to fix
Update
- discourse discourse2026.1.5, 2026.4.2, 2026.5.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| discourse discourse | 2026.1.0 ≤ v < 2026.1.5, 2026.4.0 ≤ v < 2026.4.2, 2026.5.0 ≤ v < 2026.5.1, 2026.6.0 | 2026.1.5, 2026.4.2, 2026.5.1 |
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