CVE-2026-57447 Discourse Doc Categories: Doc category index refresh leaks private topic titles

Discourse Doc Categories is a plugin for organizing Discourse topics as documentation. Prior to the verified source fix, the doc category index refresh resolves linked titles for private messages or restricted category topics without enforcing the viewer's authorization. A user who can edit the...

CVE-2026-57447

The Discourse Doc Categories plugin contains a vulnerability where the doc category index refresh fails to enforce proper authorization. This allows a user with permission to edit the index topic to view titles of private messages or restricted category topics they are otherwise unauthorized to a...

CVE-2026-57447 Discourse Doc Categories: Doc category index refresh leaks private topic titles

Discourse Doc Categories is a plugin for organizing Discourse topics as documentation. Prior to the verified source fix, the doc category index refresh resolves linked titles for private messages or restricted category topics without enforcing the viewer's authorization. A user who can edit the...

CVE-2026-72722 Discourse: Duplicate lookup reveals restricted topic titles through canonicalized URLs

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, TopicLink.extractfrom, TopicLink.ensureentryfor, and TopicLink.duplicatelookup do not consistently enforce Guardian.cansee? checks when processing internal links. An authenticated user can submit...

CVE-2026-32951: Exposure of Sensitive Information to an Unauthorized Actor

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authenticated user can obtain shared draft topic titles by sending an inline onebox request with a categoryid parameter...

CVE-2026-33411

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a potential stored XSS in topic titles for the solved posts stream. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, ensure that the Content Securi...

CVE-2026-33411 Discourse's solved topic stream has potential stored XSS in topic title

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a potential stored XSS in topic titles for the solved posts stream. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, ensure that the Content Securi...

CVE-2026-33411 Discourse's solved topic stream has potential stored XSS in topic title

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a potential stored XSS in topic titles for the solved posts stream. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, ensure that the Content Securi...

Discourse cross-site scripting vulnerabilities

Discourse is an open-source community discussion platform developed by Discourse. This platform includes features such as communities, email communication, and chat rooms. Versions of Discourse prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contained a cross-site scripting vulnerability. This...

PT-2026-26705

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.3.0-latest.1 Discourse versions prior to 2026.2.1 Discourse versions prior to 2026.1.2 Description Discourse, an open-source discussion platform, is affected by a potential stored Cross-Site Scripting XSS issue...

CVE-2026-33411: Improper Neutralization of Input During Web Page Generation

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a potential stored XSS in topic titles for the solved posts stream. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, ensure that the Content Securi...

CVE-2026-27934

Discourse versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 expose topic titles and post excerpts through a user action API endpoint to unauthorized users due to missing visibility checks. The issue enables information disclosure with a CVSS 4.0 base score of 8.7 (HIGH) and no user inte...

CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a lack of visibility checks with a user action API endpoint that results in disclosure of the title and post excerpt to unauthorized users, leading to information disclosure. Versions...

CVE-2025-27149 Zulip exports can leak private data

Zulip server provides an open-source team chat that helps teams stay productive and focused. Prior to 10.0, the data export to organization administrators feature in Zulip leaks private data. The collection of user-agent types identifying specific integrations or HTTP libraries E.g.,...

CVE-2023-43657 Improper escaping of encrypted topic titles can lead to Cross-site Scripting under non-default site configuration

discourse-encrypt is a plugin that provides a secure communication channel through Discourse. Improper escaping of encrypted topic titles could lead to a cross site scripting XSS issue when a site has content security policy CSP headers disabled. Having CSP disabled is a non-default configuration...

CVE-2023-43657

discourse-encrypt is a plugin that provides a secure communication channel through Discourse. Improper escaping of encrypted topic titles could lead to a cross site scripting XSS issue when a site has content security policy CSP headers disabled. Having CSP disabled is a non-default configuration...

CVE-2023-43657: Improper Neutralization of Input During Web Page Generation

discourse-encrypt is a plugin that provides a secure communication channel through Discourse. Improper escaping of encrypted topic titles could lead to a cross site scripting XSS issue when a site has content security policy CSP headers disabled. Having CSP disabled is a non-default configuration...

PT-2023-3566 · 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 is related to insufficient input validation when processing topic titles, allowing a remote attacker to impact the integrity and availability ...

PT-2022-26174 · Discourse · Discourse

Name of the Vulnerable Software and Affected Versions: Discourse versions prior to 2.8.12 Discourse versions prior to 2.9.0.beta13 Description: Discourse is an open-source discussion platform. Under certain conditions, a user can see notifications for topics they no longer have access to,...

PT-2022-24939 · Discourse · Discourse

Name of the Vulnerable Software and Affected Versions: Discourse versions prior to the latest stable, beta and tests-passed versions Description: The issue affects Discourse, a platform for community discussion. Under certain conditions, a user badge may be awarded based on a user's activity in a...