CVE-2026-44782 PUBLISHED

Discourse: GroupPostSerializer leaks hidden full names through reaction post association

Assigner: GitHub_M
Reserved: 07.05.2026 Published: 12.06.2026 Updated: 12.06.2026

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 include_user_long_name? as the predicate for its :name attribute, but AMS looks for include_name?. The misnamed predicate was never called, so object.user.name was always serialized regardless of SiteSetting.enable_names. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.

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 >= 2026.1.0-latest, < 2026.1.4 is affected
  • Version >= 2026.3.0-latest, < 2026.3.1 is affected
  • Version >= 2026.4.0-latest, < 2026.4.1 is affected

References

Problem Types

  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE