Discourse Backup File Disclosure Via Default Nginx Configuration

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...

Discourse OAuth Social Login - Cross-site Scripting

Discourse versions prior to 3.5.0.beta6 contain a stored Cross-Site Scripting XSS vulnerability in the OAuth/social login functionality. The vulnerability is caused by lack of proper content security policy enforcement when processing social login failures,allowing remote attackers to inject and...

Discourse <=2026.2.0 - Hidden Post Revision Disclosure via revert_to Authorization Bypass

Discourse versions before 2026.1.2, 2026.2.1, and 2026.3.0-latest.1 contain an authorization bypass in PostsControllerdisplaypost. The controller calls post.reverttoparams:version directly whenever a version query parameter is present, without checking whether the corresponding PostRevision is...

Discourse - Private User Field Disclosure via Directory Items IDOR

Discourse prior to 2025.12.2, 2026.1.1, and 2026.2.0 contains an IDOR vulnerability caused by lack of authorization checks on userfieldids parameter in DirectoryItemsControllerindex, letting any user retrieve private user field values, exploit requires no authentication. id: CVE-2026-26265 info:...

CVE-2024-52794-Discourse-Stored-XSS

CVE-2024-52794 – Discourse における格納型クロスサイトスクリプティング XSS 概要 オープンソースのフォーラムプラットフォームである Discourse において、格納型クロスサイトスクリプティング XSS の脆弱性を発見しました。この脆弱性により、攻撃者はアップロードされた画像のファイル名に悪意のあるペイロードを埋め込むことで、被害者のブラウザ上で任意の JavaScript を実行できます。これは公開トピック、コメント、プライベートメッセージなど、複数のユーザー操作ベクトルに影響します。 CVE 識別子 CVE: CVE-2024-52794 アドバイザリ...

CVE-2021-3138

..| Discourse 2.7.0 - CVE-2021-3138 |.. 説明 : 2FAバイパスにつながるレート制限バイパス テスト済みバージョン : 2.7.0 攻撃タイプ: リモート 影響 : 2FAバイパス 製品ベンダー : https://www.discourse.org 追加情報 : Discourseは、次の10年のインターネットのために構築されたディスカッションプラットフォームです。以下の用途で使用されています： -メーリングリスト -ディスカッションフォーラム -長文チャットルーム...

CVE-2023-47119

目次 CVE-2023-47119 詳細分析 POC エスカレーション？ ラボセットアップ CVE-2023-47119 これはCVE-2023-47119のPOCです。この脆弱性は、Discourseのstableブランチのバージョン3.1.3以前、およびbetaブランチとtests-passedブランチのバージョン3.2.0.beta3以前に影響します。一部のリンクは、Oneboxエンジンを介してレンダリングされるときに任意のHTMLタグを注入する可能性があります。 詳細分析 記事 :...

discourse-CVE-2023-45806

yksivaihde-CVE-2023-45806 CVE: https://github.com/discourse/discourse/security/advisories/GHSA-hcgf-hg2g-mw78 パッチ: https://github.com/discourse/discourse/commit/7d484864fe91ff79c478f57e7ddb1235d701921e 使用法: fixquoteattribution"Username|", , ここで "Username|" は引用属性内の一意な検索文字列です...

CVE-2026-59829

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.1, on sites with category group moderation enabled, the review queue could include an excerpt and permalink of the private message attached to a flag, even when the reviewing category moderator was...

CVE-2026-55704

Discourse is an open-source discussion platform. Prior o 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, users who were allowed to view a group’s activity, but were not permitted to see shared drafts, could still receive shared-draft entries through the group posts and group mentions endpoints. This...

CVE-2026-53960

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, hidden or otherwise unviewable first-post content was leaked as an excerpt in the publicly-served Q&A QAPage JSON-LD structured data, exposing it to any unauthenticated visitor and to search-engi...

CVE-2026-55674

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, an unauthenticated attacker could send a single request with a crafted colorschemeid or darkschemeid cookie to inject arbitrary HTML into a Discourse page. Because the cookie value was rendered...

CVE-2026-53960

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, hidden or otherwise unviewable first-post content was leaked as an excerpt in the publicly-served Q&A QAPage JSON-LD structured data, exposing it to any unauthenticated visitor and to search-engi...

CVE-2026-53960

Discourse leaked hidden first-post excerpts in publicly served QAPage JSON-LD structured data, accessible to unauthenticated visitors and search-engine crawlers. Fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0. No exploitation reported. CVSS 5.3 MEDIUM (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:...

EUVD-2026-60238

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, hidden or otherwise unviewable first-post content was leaked as an excerpt in the publicly-served Q&A QAPage JSON-LD structured data, exposing it to any unauthenticated visitor and to search-engi...

CVE-2026-53960 Discourse: Hidden first-post excerpt is emitted in Q&A schema JSON-LD

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, hidden or otherwise unviewable first-post content was leaked as an excerpt in the publicly-served Q&A QAPage JSON-LD structured data, exposing it to any unauthenticated visitor and to search-engi...

CVE-2026-53960 Discourse: Hidden first-post excerpt is emitted in Q&A schema JSON-LD

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, hidden or otherwise unviewable first-post content was leaked as an excerpt in the publicly-served Q&A QAPage JSON-LD structured data, exposing it to any unauthenticated visitor and to search-engi...

CVE-2026-55704 Discourse: Shared-draft titles and excerpts leak through group post serialization

Discourse is an open-source discussion platform. Prior o 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, users who were allowed to view a group’s activity, but were not permitted to see shared drafts, could still receive shared-draft entries through the group posts and group mentions endpoints. This...

CVE-2026-55704

Discourse is an open-source discussion platform. Prior o 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, users who were allowed to view a group’s activity, but were not permitted to see shared drafts, could still receive shared-draft entries through the group posts and group mentions endpoints. This...

CVE-2026-55704 Discourse: Shared-draft titles and excerpts leak through group post serialization

Discourse is an open-source discussion platform. Prior o 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, users who were allowed to view a group’s activity, but were not permitted to see shared drafts, could still receive shared-draft entries through the group posts and group mentions endpoints. This...