CVE-2026-55704 PUBLISHED

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

Assigner: GitHub_M
Reserved: 17.06.2026 Published: 17.08.2026 Updated: 17.08.2026

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 This could disclose shared-draft topic titles and post excerpt/content, resulting in an information disclosure of unpublished draft material.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

Metrics

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

Product Status

Vendor discourse
Product discourse
Versions
  • Version < 2026.1.6 is affected
  • Version >= 2026.5.0-latest, < 2026.5.2 is affected
  • Version >= 2026.6.0-latest, < 2026.6.1 is affected

References

Problem Types

  • CWE-862: Missing Authorization CWE