BIT-discourse-2026-45780: Discourse: Private event sample invitees are serialized to non-invited event viewers
Discourse versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5 have a vulnerability where private event invitee information is exposed to unauthorized users. Specifically, the EventSerializer component could leak invited group names, sample invitees, and attendance statistics to users who can view the topic but should not see the private event invitee list. This issue has been fixed in the stated versions.
AI Analysis
Technical Summary
Discourse, an open-source discussion platform, contained a vulnerability (CVE-2026-45780) in versions before 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5. The EventSerializer component improperly serialized private event invitee details, including invited group names, sample invitees, and attendance statistics, to users who had topic viewing permissions but were not authorized to view the private event invitee list. This information disclosure flaw could lead to unauthorized exposure of private event participation details. The vulnerability is addressed in the fixed versions mentioned.
Potential Impact
Unauthorized users who can view a topic could gain access to private event invitee information, including group names, sample invitees, and attendance statistics. This represents an information disclosure risk affecting privacy of event participants. There are no known exploits in the wild. The severity is assessed as medium.
Mitigation Recommendations
Upgrade Discourse to versions 2026.6.0, 2026.5.1, 2026.4.2, or 2026.1.5 or later, where this vulnerability has been fixed. No other mitigation is indicated by the vendor advisory.
BIT-discourse-2026-45780: Discourse: Private event sample invitees are serialized to non-invited event viewers
Description
Discourse versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5 have a vulnerability where private event invitee information is exposed to unauthorized users. Specifically, the EventSerializer component could leak invited group names, sample invitees, and attendance statistics to users who can view the topic but should not see the private event invitee list. This issue has been fixed in the stated versions.
Affected software
pkg:bitnami/discourseRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Discourse, an open-source discussion platform, contained a vulnerability (CVE-2026-45780) in versions before 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5. The EventSerializer component improperly serialized private event invitee details, including invited group names, sample invitees, and attendance statistics, to users who had topic viewing permissions but were not authorized to view the private event invitee list. This information disclosure flaw could lead to unauthorized exposure of private event participation details. The vulnerability is addressed in the fixed versions mentioned.
Potential Impact
Unauthorized users who can view a topic could gain access to private event invitee information, including group names, sample invitees, and attendance statistics. This represents an information disclosure risk affecting privacy of event participants. There are no known exploits in the wild. The severity is assessed as medium.
Mitigation Recommendations
Upgrade Discourse to versions 2026.6.0, 2026.5.1, 2026.4.2, or 2026.1.5 or later, where this vulnerability has been fixed. No other mitigation is indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-discourse-2026-45780
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-45780"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- Medium
- Cvss Version
- null
Threat ID: 6a58b51b68715ace43db4776
Added to database: 07/16/2026, 10:40:27 UTC
Last enriched: 07/16/2026, 14:30:25 UTC
Last updated: 07/17/2026, 02:11:04 UTC
Views: 12
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