CVE-2024-28242

Discourse is an open source platform for community discussion. In affected versions an attacker can learn that secret categories exist when they have backgrounds set. The issue is patched in the latest stable, beta and tests-passed version of Discourse. Users are advised to upgrade. Users unable ...

CVE-2024-49765

Discourse is an open source platform for community discussion. Sites that are using discourse connect but still have local logins enabled could allow attackers to bypass discourse connect to create accounts and login. This problem is patched in the latest version of Discourse. Users unable to...

CVE-2023-48297

Discourse is a platform for community discussion. The message serializer uses the full list of expanded chat mentions @all and @here which can lead to a very long array of users. This issue was patched in versions 3.1.4 and beta 3.2.0.beta5...

CVE-2022-31060

Discourse is an open-source discussion platform. Prior to version 2.8.4 in the stable branch and version 2.9.0.beta5 in the beta and tests-passed branches, banner topic data is exposed on login-required sites. This issue is patched in version 2.8.4 in the stable branch and version 2.9.0.beta5 in...

CVE-2022-24850

Discourse is an open source platform for community discussion. A category's group permissions settings can be viewed by anyone that has access to the category. As a result, a normal user is able to see whether a group has read/write permissions in the category even though the information should...

CVE-2021-41095

Discourse is an open source discussion platform. There is a cross-site scripting XSS vulnerability in versions 2.7.7 and earlier of the stable branch, versions 2.8.0.beta6 and earlier of the beta branch, and versions 2.8.0.beta6 and earlier of the tests-passed branch. Rendering of some error...

CVE-2019-1020017

Discourse before 2.3.0 and 2.4.x before 2.4.0.beta3 lacks a confirmation screen when logging in via a user-api OTP...

CVE-2019-15515

Discourse 2.3.2 sends the CSRF token in the query string...

CVE-2019-1020018

Discourse before 2.3.0 and 2.4.x before 2.4.0.beta3 lacks a confirmation screen when logging in via an email link...

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-2021-37633

Discourse is an open source discussion platform. In versions prior to 2.7.8 rendering of d-popover tooltips can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest...

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-2024-56197

Discourse is an open source platform for community discussion. PM titles and metadata can be read by other users when the "PM tags allowed for groups" option is enabled, the other user is a member of a group added to this option, and the PM has been tagged. This issue has been patched in the late...

CVE-2025-22602

Discourse is an open source platform for community discussion. In affected versions an attacker can execute arbitrary JavaScript on users' browsers by posting a malicious video placeholder html element. This issue only affects sites with CSP disabled. This problem has been patched in the latest...

CVE-2024-36113

Discourse flaw: prior to 3.2.3 (stable), 3.3.0.beta3 (beta) and 3.3.0.beta4-dev (tests-passed), a rogue staff user could suspend other staff, blocking logins. Root cause: missing authorization checks for suspending admins/moderators. Fixes are in 3.2.3 (stable), 3.3.0.beta3 (beta), and 3.3.0.beta...

CVE-2023-30538 Stored Cross-site Scripting via improper sanitization of svg files in Discourse

Discourse is an open source platform for community discussion. Due to the improper sanitization of SVG files, an attacker can execute arbitrary JavaScript on the users’ browsers by uploading a crafted SVG file. This issue is patched in the latest stable and tests-passed versions of Discourse. Use...

Vulnerabilities fixed in Discourse

Vulnerabilities have been fixed in Discourse. The vulnerabilities allow a malicious person to perform attacks that lead to the following categories of damage: Cross-Site Scripting XSS. Manipulation of data Access to system data When the "Mermaid" component is in use, there is also the possibility...

CVE-2022-46168 Group SMTP user emails are exposed in CC email header

Discourse is an option source discussion platform. Prior to version 2.8.14 on the stable branch and version 2.9.0.beta15 on the beta and tests-passed branches, recipients of a group SMTP email could see the email addresses of all other users inside the group SMTP topic. Most of the time this is n...

CVE-2021-3138

In Discourse 2.7.0 through beta1, a rate-limit bypass leads to a bypass of the 2FA requirement for certain forms...

Discourse: Account takeover at https://try.discourse.org due to no CSRF protection in connecting Yahoo account

Hi There is an option in https://try.discourse.org/u/testh1ay/preferences/account to connect our Yahoo account. I noticed Connect Yahoo account option have the workflow with GET method and there is lack of csrf protection on connecting yahoo account which can help attacker into inducing victim to...