What’s Vulnerable › Vulnerabilities

CVE-2026-45780: Discourse: Private event sample invitees are serialized to non-invited event viewers

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-09 · updated 2026-07-14
• Weakness: CWE-200

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.

Affected products

• discourse: from 2026.1.0 before 2026.1.5; from 2026.4.0 before 2026.4.2; from 2026.5.0 before 2026.5.1; 2026.6.0 — fixed in 2026.1.5, 2026.4.2, 2026.5.1

How to fix

Upgrade to a fixed version: discourse 2026.1.5, 2026.4.2, 2026.5.1. Check the vendor advisory for mitigations.

References

• https://github.com/discourse/discourse/commit/37969503f20369eb1712b7b88daedcfb4f63f5f1
• https://github.com/discourse/discourse/commit/4d46638041b5f3d1e1f7f6f6f19c1df3bd65a586
• https://github.com/discourse/discourse/commit/6457ab71f36a2d1440fe96af0a2593897844b023
• https://github.com/discourse/discourse/commit/7deb4b6963442569357b41e61febe37594e5e730
• https://github.com/discourse/discourse/releases/tag/v2026.1.5
• https://github.com/discourse/discourse/releases/tag/v2026.4.2
• https://github.com/discourse/discourse/releases/tag/v2026.5.1
• https://github.com/discourse/discourse/releases/tag/v2026.6.0
• https://github.com/discourse/discourse/security/advisories/GHSA-22v7-6wgj-g9f7

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