CVE-2026-34947: Discourse

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, staged user custom fields and username are exposed on public invite pages without email verification. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

Affected products

• Discourse Discourse: from 2026.1.0, up to and including 2026.1.2; from 2026.2.0, up to and including 2026.2.1; version 2026.3.0 only

Published 2026-04-03. Last modified 2026-07-24.