CVE-2026-23743 Discourse allows permalinks to restricted resources to leak resource slugs to unauthorized users

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources private topics, categories, posts, or hidden tags were redirecting users to URLs containing the resource slug, even when the user...

CVE-2026-23743

Summary of CVE-2026-23743 (Discourse) : Prior to versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks to access-restricted resources (private topics/categories/posts/hidden tags) could redirect to URLs containing the resource slug in the Location header or 404 search box, leaking potent...

CVE-2026-21865 Discourse topic conversion permission vulnerability for moderators

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a...

EUVD-2026-4874

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a...

CVE-2026-21865

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a...

CVE-2025-69289 Discourse has insecure default configuration that allows non-admin moderators to takeover any non-staff account via email change

Discourse is an open source discussion platform. A privilege escalation vulnerability in versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 allows a non-admin moderator to bypass email-change restrictions, allowing a takeover of non-staff accounts. This issue is patched in versions 3.5.4...

CVE-2025-69218 Discourse moderators can access admin-only reports exposing private upload URLs

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can access the topuploads admin report which should be restricted to admins only. This report displays direct URLs to all uploaded files on the site, including sensitive...

CVE-2025-68933 Discourse non-admin moderators can exfiltrate private content via post ownership transfer

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, non-admin moderators with the moderatorschangepostownership setting enabled can change ownership of posts in private messages and restricted categories they cannot access, then export...

CVE-2025-68933 Discourse non-admin moderators can exfiltrate private content via post ownership transfer

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, non-admin moderators with the moderatorschangepostownership setting enabled can change ownership of posts in private messages and restricted categories they cannot access, then export...

CVE-2025-68933

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, non-admin moderators with the moderatorschangepostownership setting enabled can change ownership of posts in private messages and restricted categories they cannot access, then export...

CVE-2025-68933

CVE-2025-68933 (Discourse) is a broken access control vulnerability affecting Discourse versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. Non-admin moderators with the moderators_change_post_ownership setting enabled can change ownership of posts in private messages and restricted cate...

EUVD-2025-206428

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, non-admin moderators with the moderatorschangepostownership setting enabled can change ownership of posts in private messages and restricted categories they cannot access, then export...

CVE-2025-68933 Discourse non-admin moderators can exfiltrate private content via post ownership transfer

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, non-admin moderators with the moderatorschangepostownership setting enabled can change ownership of posts in private messages and restricted categories they cannot access, then export...

CVE-2025-68479

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, some subscription endpoints lack proper checking for ownership before making changes. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds...

CVE-2025-66488

Discourse is an open source discussion platform. A vulnerability present in versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 affects anyone who uses S3 for uploads. While scripts may be executed, they will only be run in the context of the S3/CDN domain, with no site credentials...

EUVD-2025-206423

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, users archives are viewable by users with moderation privileges even though moderators should not have access to the archives. Private topic/post content made by the users are leaked...

EUVD-2025-206421

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, a hostname validation issue in FinalDestination could allow bypassing SSRF protections under certain conditions. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and...

CVE-2025-68659 Discourse has DoS vulnerability in username change endpoint

Discourse is an open source discussion platform. Versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 have an application level denial of service vulnerabilityin the username change functionality at try.discourse.org. The vulnerability allows attackers to cause noticeable server delays and...

CVE-2025-68479 Discourse subscriptions are susceptible to takeover

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, some subscription endpoints lack proper checking for ownership before making changes. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds...

EUVD-2025-206450

Discourse is an open source discussion platform. Versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 have a content-security-policy-mitigated cross-site scriptinv vulnerability on the Discourse Math plugin when using its KaTeX variant. This issue is patched in versions 3.5.4, 2025.11.2,...