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

Published Aug 17, 2026

Updated

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 This could disclose shared-draft topic titles and post excerpt/content, resulting in an information disclosure of unpublished draft material. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Affected Software

1 affected component

Discourse Discourse>, >, >, >

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Discourse to a version that resolves this vulnerability.
Fixed in 2026.1.6
Upgrade
Upgrade Discourse to a version that resolves this vulnerability.
Fixed in 2026.5.2
Upgrade
Upgrade Discourse to a version that resolves this vulnerability.
Fixed in 2026.6.1
Upgrade
Upgrade Discourse to a version that resolves this vulnerability.
Fixed in 2026.7.0

Event History

Aug 17, 2026

CVE Published

via MITRE·03:31 PM

Data Sourced

via MITRE·03:31 PM

DescriptionSeverityWeakness

Frequently Asked Questions

What is the severity of CVE-2026-55704?

CVE-2026-55704 has a medium severity score of 4.3.

How do I fix CVE-2026-55704?

To address CVE-2026-55704, upgrade to Discourse versions 2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0.

What risk does CVE-2026-55704 pose?

CVE-2026-55704 poses a risk of leaking shared-draft titles and excerpts through group post serialization.

Which versions of Discourse are affected by CVE-2026-55704?

CVE-2026-55704 affects versions prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

What is the impact of CVE-2026-55704?

The impact of CVE-2026-55704 is that unauthorized users may access shared-draft content through group posts.