CVE-2024-45051

Discourse is an open source platform for community discussion. A maliciously crafted email address could allow an attacker to bypass domain-based restrictions and gain access to private sites, categories and/or groups. This issue has been patched in the latest stable, beta and tests-passed versio...

Discourse < 3.3.4 Multiple Vulnerabilities

Discourse is prone to multiple vulnerabilities. SPDX-FileCopyrightText: 2025 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only CPE = "cpe:/a:discourse:discourse"; ifdescripti...

Discourse 3.4.x < 3.4.0.beta5 Multiple Vulnerabilities

Discourse is prone to an information disclosure vulnerability. SPDX-FileCopyrightText: 2025 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only CPE =...

CVE-2024-53991

Discourse is an open source platform for community discussion. This vulnerability only impacts Discourse instances configured to use FileStore::LocalStore which means uploads and backups are stored locally on disk. If an attacker knows the name of the Discourse backup file, the attacker can trick...

CVE-2024-35227

Discourse is an open-source discussion platform. Prior to version 3.2.3 on the stable branch and version 3.3.0.beta3 on the tests-passed branch, Oneboxing against a carefully crafted malicious URL can reduce the availability of a Discourse instance. The problem has been patched in version 3.2.3 o...

CVE-2024-53266

Discourse is an open source platform for community discussion. In affected versions with some combinations of plugins, and with CSP disabled, activity streams in the user's profile page may be vulnerable to XSS. This has been patched in the latest version of Discourse core. Users are advised to...

CVE-2024-53851

Discourse is an open source platform for community discussion. In affected versions the endpoint for generating inline oneboxes for URLs wasn't enforcing limits on the number of URLs that it accepted, allowing a malicious user to inflict denial of service on some parts of the app. This...

CVE-2024-53994

Discourse is an open source platform for community discussion. In affected versions users who disable chat in preferences could still be reachable in some cases. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should disable...

CVE-2024-53266 Cross-site Scripting (XSS) via topic titles when CSP disabled in Discourse

Discourse is an open source platform for community discussion. In affected versions with some combinations of plugins, and with CSP disabled, activity streams in the user's profile page may be vulnerable to XSS. This has been patched in the latest version of Discourse core. Users are advised to...

CVE-2024-53266 Cross-site Scripting (XSS) via topic titles when CSP disabled in Discourse

Discourse is an open source platform for community discussion. In affected versions with some combinations of plugins, and with CSP disabled, activity streams in the user's profile page may be vulnerable to XSS. This has been patched in the latest version of Discourse core. Users are advised to...

CVE-2024-53266 Cross-site Scripting (XSS) via topic titles when CSP disabled in Discourse

Discourse is an open source platform for community discussion. In affected versions with some combinations of plugins, and with CSP disabled, activity streams in the user's profile page may be vulnerable to XSS. This has been patched in the latest version of Discourse core. Users are advised to...

CVE-2024-53266

CVE-2024-53266 affects Discourse (open source discussion platform). In affected versions, with certain plugins and CSP disabled, the activity streams on a user’s profile page are vulnerable to cross-site scripting (XSS). The issue stems from how profile activity is rendered when CSP is not enforc...

CVE-2024-53851

CVE-2024-53851 affects Discourse: an issue in the endpoint that generates inline oneboxes for URLs did not enforce limits on accepted URLs, enabling authenticated users to trigger denial of service in parts of the app. The vulnerability is mitigated by upgrading to the latest stable, beta, or tes...

CVE-2024-53851 Partial denial of service via inline oneboxes in Discourse

Discourse is an open source platform for community discussion. In affected versions the endpoint for generating inline oneboxes for URLs wasn't enforcing limits on the number of URLs that it accepted, allowing a malicious user to inflict denial of service on some parts of the app. This...

CVE-2024-53851 Partial denial of service via inline oneboxes in Discourse

Discourse is an open source platform for community discussion. In affected versions the endpoint for generating inline oneboxes for URLs wasn't enforcing limits on the number of URLs that it accepted, allowing a malicious user to inflict denial of service on some parts of the app. This...

CVE-2024-53851 Partial denial of service via inline oneboxes in Discourse

Discourse is an open source platform for community discussion. In affected versions the endpoint for generating inline oneboxes for URLs wasn't enforcing limits on the number of URLs that it accepted, allowing a malicious user to inflict denial of service on some parts of the app. This...

CVE-2025-23023

Discourse is an open source platform for community discussion. In affected versions an attacker can carefully craft a request with the right request headers to poison the anonymous cache for example, the cache may have a response with missing preloaded data. This issue only affects anonymous...

CVE-2024-55948

Discourse is an open source platform for community discussion. In affected versions an attacker can make craft an XHR request to poison the anonymous cache for example, the cache may have a response with missing preloaded data. This issue only affects anonymous visitors of the site. This problem...

CVE-2024-56328

Discourse is an open source platform for community discussion. An attacker can execute arbitrary JavaScript on users' browsers by posting a maliciously crafted onebox url. This issue only affects sites with CSP disabled. This problem has been patched in the latest version of Discourse. Users are...

CVE-2025-22601

Discourse is an open source platform for community discussion. In affected versions an attacker can trick a target user to make changes to their own username via carefully crafted link using the activate-account route. This problem has been patched in the latest version of Discourse. Users are...