CVE-2026-44780

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, ReviewableQueuedPostSerializer unconditionally included payload"rawemail" for posts that arrived via incoming email...

CVE-2026-44782

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, GroupPostSerializer declared includeuserlongname? as the predicate for its :name attribute, but AMS looks for includename?...

CVE-2026-44779

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, bot debug endpoints disclose whisper translation audit logs. This issue has been patched in versions 2026.1.4, 2026.3.1,...

CVE-2026-47264 Discourse: Don't leak restricted tag group names via tag info

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, DetailedTagSerializertaggroupnames returned every tag group a tag belonged to without filtering against the requesting...

EUVD-2026-36561

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, DetailedTagSerializertaggroupnames returned every tag group a tag belonged to without filtering against the requesting...

CVE-2026-47263 Discourse: Prevent webhook payload disclosure on event redelivery

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, the MessageBus.publish call for /webhookevents/ in Jobs::RedeliverWebHookEvents did not pass groupids, leaving the channel...

EUVD-2026-36560

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, the MessageBus.publish call for /webhookevents/ in Jobs::RedeliverWebHookEvents did not pass groupids, leaving the channel...

CVE-2026-47263 Discourse: Prevent webhook payload disclosure on event redelivery

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, the MessageBus.publish call for /webhookevents/ in Jobs::RedeliverWebHookEvents did not pass groupids, leaving the channel...

CVE-2026-47263 Discourse: Prevent webhook payload disclosure on event redelivery

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, the MessageBus.publish call for /webhookevents/ in Jobs::RedeliverWebHookEvents did not pass groupids, leaving the channel...

CVE-2026-47263

Summary: Discourse platforms affected by CVE-2026-47263 expose a channel via Webhook events due to a missing group_ids parameter in MessageBus.publish for /web_hook_events/, making the channel readable by any authenticated user (or anonymous users when login is disabled). Impact (as stated): Webh...

CVE-2026-45775 Discourse: Cross-site backup access via path traversal in multisite local backups

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, a path traversal vulnerability in Discourse backup handling could allow an authenticated administrator on one site in a...

EUVD-2026-36559

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, a path traversal vulnerability in Discourse backup handling could allow an authenticated administrator on one site in a...

CVE-2026-45775 Discourse: Cross-site backup access via path traversal in multisite local backups

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, a path traversal vulnerability in Discourse backup handling could allow an authenticated administrator on one site in a...

CVE-2026-45085 Discourse: Chat misauthorization and information disclosure

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, four authorization/disclosure issues in the chat plugin one also involving discourse-calendar: read-only category users...

CVE-2026-45085

CVE-2026-45085 affects Discourse with the chat plugin (calendar-capable variant also involved). The issues span four authorization/disclosure problems observed in versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1. They include:...

CVE-2026-45085 Discourse: Chat misauthorization and information disclosure

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, four authorization/disclosure issues in the chat plugin one also involving discourse-calendar: read-only category users...

CVE-2026-44785 Discourse: Hidden reply-to post raw can be disclosed through AI explain prompts

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, the AI "explain" helper only checks cansee? on the post being explained, not its replytopost, so any authenticated user wi...

EUVD-2026-36557

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, the AI "explain" helper only checks cansee? on the post being explained, not its replytopost, so any authenticated user wi...

CVE-2026-44785 Discourse: Hidden reply-to post raw can be disclosed through AI explain prompts

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, the AI "explain" helper only checks cansee? on the post being explained, not its replytopost, so any authenticated user wi...

CVE-2026-44785

CVE-2026-44785 affects Discourse. The vulnerability arises because the AI "explain" helper validates can_see? only on the post being explained, allowing an authenticated user with access to the AI helper to read the raw contents of a hidden parent post by invoking Explain on a reply to it. Affect...