CVE-2026-27021

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, the voters endpoint in the poll plugin lacked post visibility checks which allowed unauthorized access to voters details of polls in any post. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the...

CVE-2026-27021 Discourse: Poll voters endpoint lacked post visibility checks

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, the voters endpoint in the poll plugin lacked post visibility checks which allowed unauthorized access to voters details of polls in any post. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the...

EUVD-2026-8887

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, the voters endpoint in the poll plugin lacked post visibility checks which allowed unauthorized access to voters details of polls in any post. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the...

CVE-2026-27021

Summary of CVE-2026-27021 (Discourse) : The vulnerability affects the poll voters endpoint, where lack of post visibility checks allowed unauthorized access to voters’ details for polls in any post. Affected versions include 2025.12.2, 2026.1.1, and 2026.2.0. The issue is addressed in these versi...

CVE-2026-27021 Discourse: Poll voters endpoint lacked post visibility checks

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, the voters endpoint in the poll plugin lacked post visibility checks which allowed unauthorized access to voters details of polls in any post. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the...

EUVD-2026-8879

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users are able to close, archive and pin topics in private categories they don't have access to. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available...

CVE-2026-26979

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users are able to close, archive and pin topics in private categories they don't have access to. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available...

CVE-2026-26979

CVE-2026-26979 affects Discourse: TL4 users can close, archive, or pin topics in private categories they lack access to. Fixed in versions 2025.12.2, 2026.1.1, and 2026.2.0. Impact is unauthorized topic status changes with LOW severity (CVSS 3.1: none certain, I=LOW). No workarounds are reported....

CVE-2026-26979 Discourse: TL4 users are able to change status of restricted topics

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users are able to close, archive and pin topics in private categories they don't have access to. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available...

CVE-2026-26979 Discourse: TL4 users are able to change status of restricted topics

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users are able to close, archive and pin topics in private categories they don't have access to. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available...

CVE-2026-26973 Discourse doesn't scope reviewable notes to user-visible reviewables

Discourse is an open source discussion platform. Versions prior to 2025.12.2, 2026.1.1, and 2026.2.0 have an IDOR Insecure Direct Object Reference in ReviewableNotesController. When enablecategorygroupmoderation is enabled, a user belonging to a category moderation group can create or delete thei...

CVE-2026-26973

Summary: CVE-2026-26973 affects Discourse before versions 2025.12.2, 2026.1.1, and 2026.2.0, where an IDOR in the ReviewableNotesController allows a user in a category moderation group to create or delete notes on any reviewable when enable_category_group_moderation is on. Root cause: unscoped Re...

CVE-2026-26973

Discourse is an open source discussion platform. Versions prior to 2025.12.2, 2026.1.1, and 2026.2.0 have an IDOR Insecure Direct Object Reference in ReviewableNotesController. When enablecategorygroupmoderation is enabled, a user belonging to a category moderation group can create or delete thei...

CVE-2026-26207

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, discourse-policy plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The PolicyController loads posts by ID without verifying the current...

CVE-2026-26265

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The userfieldids parameter ...

CVE-2026-26265 Discourse has IDOR vulnerability in the directory items endpoint

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The userfieldids parameter ...

CVE-2026-26265

Discourse versions prior to 2025.12.2, 2026.1.1, and 2026.2.0 expose an IDOR in the directory items endpoint (GET /directory_items.json?period=all&user_field_ids=...). The DirectoryItemsController#index accepts arbitrary user_field_ids without proper authorization, bypassing visibility controls a...

CVE-2026-26265 Discourse has IDOR vulnerability in the directory items endpoint

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The userfieldids parameter ...

CVE-2026-26207 DIscourse's discourse-policy plugin lacks post access check

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, discourse-policy plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The PolicyController loads posts by ID without verifying the current...

CVE-2026-26207

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, discourse-policy plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The PolicyController loads posts by ID without verifying the current...