CVE-2026-23743

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources private topics, categories, posts, or hidden tags were redirecting users to URLs containing the resource slug, even when the user...

CVE-2026-23743

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources private topics, categories, posts, or hidden tags were redirecting users to URLs containing the resource slug, even when the user...

CVE-2026-21865

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a...

EUVD-2026-4861

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources private topics, categories, posts, or hidden tags were redirecting users to URLs containing the resource slug, even when the user...

CVE-2026-23743 Discourse allows permalinks to restricted resources to leak resource slugs to unauthorized users

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources private topics, categories, posts, or hidden tags were redirecting users to URLs containing the resource slug, even when the user...

CVE-2026-23743

Summary of CVE-2026-23743 (Discourse) : Prior to versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks to access-restricted resources (private topics/categories/posts/hidden tags) could redirect to URLs containing the resource slug in the Location header or 404 search box, leaking potent...

EUVD-2026-4874

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a...

CVE-2026-21865 Discourse topic conversion permission vulnerability for moderators

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a...

CVE-2026-21865

Discourse advisory CVE-2026-21865 affects Discourse versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, where moderators could convert some personal messages to public topics despite lacking access. The issue is patched in 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. Remediation options in...

CVE-2026-21865 Discourse topic conversion permission vulnerability for moderators

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a...

CVE-2026-21865 Discourse topic conversion permission vulnerability for moderators

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a...

CVE-2026-21865

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a...

Discourse security vulnerabilities

Discourse is an open-source community discussion platform developed by Discourse. This platform includes features such as communities, email communication, and chat rooms. Vulnerabilities exist in versions of Discourse prior to 3.5.4, as well as versions prior to 2025.11.2, 2025.12.1, and 2026.1....

PT-2026-5211

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 3.5.4 Discourse versions prior to 2025.11.2 Discourse versions prior to 2025.12.1 Discourse versions prior to 2026.1.0 Description Discourse is an open source discussion platform. Permalinks to access-restricted...

PT-2026-5210

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 3.5.4 Discourse versions prior to 2025.11.2 Discourse versions prior to 2025.12.1 Discourse versions prior to 2026.1.0 Description Discourse is an open source discussion platform. Moderators may be able to convert...

CVE-2023-31456

There is an SSRF vulnerability in the Fluid Topics platform that affects versions prior to 4.3, where the server can be forced to make arbitrary requests to internal and external resources by an authenticated user...

CVE-2022-23656

Zulip is an open source team chat app. The main development branch of Zulip Server from June 2021 and later is vulnerable to a cross-site scripting vulnerability on the recent topics page. An attacker could maliciously craft a full name for their account and send messages to a topic with several...

CVE-2025-23749

Cross-Site Request Forgery CSRF vulnerability in progpars.net mybb Last Topics mybb-last-topics allows Stored XSS.This issue affects mybb Last Topics: from n/a through = 1.0...

CVE-2026-22535

An attacker with the ability to interact through the network and with access credentials, could, thanks to the unsecured unencrypted MQTT communications protocol, write on the server topics of the board that controls the MQTT communications...

CVE-2026-22535

An attacker with the ability to interact through the network and with access credentials, could, thanks to the unsecured unencrypted MQTT communications protocol, write on the server topics of the board that controls the MQTT communications...