CVE-2026-55704

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

State: Published
Severity: 4.3 Medium
Published: Aug 17, 2026
Updated: Aug 17, 2026
Reserved: Jun 17, 2026

Description

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 This could disclose shared-draft topic titles and post excerpt/content, resulting in an information disclosure of unpublished draft material.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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
discoursediscourse	< 2026.1.6Affected >= 2026.5.0-latest, < 2026.5.2Affected >= 2026.6.0-latest, < 2026.6.1Affected

References

https://github.com/discourse/discourse/security/advisories/GHSA-fxw4-38v9-76v8

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