CVE-2026-49256 Discourse: Hidden tag names leaked via category serializers

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, restricted tag and tag-group names attached to publicly readable categories as allowedtags, allowedtaggroups, or required tag groups could leak to anonymous and unauthorized users through categor...

CVE-2026-44786: Exposure of Sensitive Information to an Unauthorized Actor

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, chat events for public category channels are published to MessageBus without permission scoping, so any MessageBus...

CVE-2024-24748

Discourse is an open source platform for community discussion. In affected versions an attacker can learn that a secret subcategory exists under a public category which has no public subcategories. The issue is patched in the latest stable, beta and tests-passed version of Discourse. Users are...

PT-2024-20527 · Discourse · Discourse

Name of the Vulnerable Software and Affected Versions: Discourse versions prior to the latest stable, beta and tests-passed version Description: The issue allows an attacker to discover the existence of a secret subcategory under a public category with no public subcategories. There are no known...