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 - 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:...

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-CVE-2023-45806

yksivaihde-CVE-2023-45806 CVE: https://github.com/discourse/discourse/security/advisories/GHSA-hcgf-hg2g-mw78 Patch: https://github.com/discourse/discourse/commit/7d484864fe91ff79c478f57e7ddb1235d701921e usage: fixquoteattribution"Username|", , 여기서 "Username|"는 인용문 귀속quote attribution 내의 고유 검색...

CVE-2024-52794-Discourse-Stored-XSS

CVE-2024-52794 – Межсайтовый скриптинг XSS с сохранением в Discourse Краткое описание Я обнаружил уязвимость межсайтового скриптинга XSS с сохранением в Discourse — платформе форумов с открытым исходным кодом. Уязвимость позволяет атакующему выполнить произвольный JavaScript в браузере жертвы пут...

CVE-2021-3138

..| Discourse 2.7.0 - CVE-2021-3138 |.. 설명 : 속도 제한 우회로 2FA 우회로 이어짐 테스트된 버전 : 2.7.0 공격 유형: Remote 영향 : 2FA Bypass 제품 공급업체 : https://www.discourse.org 추가 정보 : Discourse는 인터넷의 다음 10년을 위해 구축된 토론 플랫폼입니다. 용도: -메일링 리스트 -토론 포럼 -장문 채팅방 Google 인수 기업과 같은 유명 기업들이 현재까지 Discourse를 사용하고 있습니다. 발견자 : Meshal...

CVE-2023-47119

목차 CVE-2023-47119 상세 분석 POC 권한 상승 ? LAB 설정 CVE-2023-47119 POC는 CVE-2023-47119의 취약점으로, Discourse의 stable 브랜치 버전 3.1.3 이전 및 beta와 tests-passed 브랜치 버전 3.2.0.beta3 이전 버전에 영향을 미칩니다. 일부 링크는 Onebox 엔진을 통해 렌더링될 때 임의의 HTML 태그를 주입할 수 있습니다. 상세 분석 글 :...

BIT-DISCOURSE-2026-91134 Discourse: Block post iframes whose encoded userinfo bypasses the allowed_iframes allowlist

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the Discourse post sanitizer allowed a stored cross-origin iframe to bypass the allowediframes prefix policy when the iframe src contained encoded userinfo. The sanitizer validated a decoded form...

BIT-DISCOURSE-2026-91133 Discourse: Escape LIKE metacharacters in upload paths to prevent disclosure

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, authenticated users could supply unescaped SQL LIKE metacharacters to upload-resolution patterns, causing wildcard input to select unrelated upload records instead of matching a literal identifie...

BIT-DISCOURSE-2026-91132 Discourse: Wildcard iframe origin allowlist bypass via authority separators

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, sites using wildcard patterns in the allowediframes setting could accept a crafted iframe URL whose allowlisted suffix appeared after a URL authority separator. The wildcard origin check matched...

BIT-DISCOURSE-2026-91123 Discourse: Reject literal backslash path separators in iframe src traversal guard

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the iframe src traversal guard did not treat literal backslashes as path separators after decoded dot segments. A crafted source could therefore pass an allowediframes subpath check while browser...

BIT-DISCOURSE-2026-91122 Discourse: Chat MessageBus delivers read-restricted messages to unauthorized users

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the video placeholder component allowed crafted HTML to cause an attribute breakout and inject an attacker-controlled event handler. An authenticated user with default trust-level posting...

BIT-DISCOURSE-2026-91121 Discourse: Chat upload filenames rendered as raw HTML in excerpts

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, attacker-controlled upload filenames used in chat message excerpts were rendered as unescaped HTML. A user able to upload a file and send chat content could place markup in a filename that was th...

BIT-DISCOURSE-2026-91120 Discourse: Stored HTML injection in video notification emails

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, provider-controlled video titles in lazy video embeds could be reparsed as HTML when Discourse generated notification emails or chat summaries. A user with standard posting privileges could creat...

BIT-DISCOURSE-2026-91119 Discourse: Encode action_code_who in mention URLs

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the topic small-action and nested-activity-log components interpolated the free-form actioncodewho value into mention-link href attributes without URL encoding. A quote-bearing display name could...

BIT-DISCOURSE-2026-84302 Discourse: Non-participant moderators can read, edit, and delete PM content through Discourse AI reviewables

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, Discourse AI reviewables associated with private messages could appear in the moderator review queue of a moderator who was not a participant in the message. Reviewable visibility filtering did n...

PT-2026-105078

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, attacker-controlled upload filenames used in chat message excerpts were rendered as unescaped HTML. A user able to upload a file and send chat content could place markup in a filename that was th...

PT-2026-105081

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, sites using wildcard patterns in the allowed iframes setting could accept a crafted iframe URL whose allowlisted suffix appeared after a URL authority separator. The wildcard origin check matched...

PT-2026-105082

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, authenticated users could supply unescaped SQL LIKE metacharacters to upload-resolution patterns, causing wildcard input to select unrelated upload records instead of matching a literal identifie...