CVE-2026-44782 — Discourse: GroupPostSerializer leaks hidden full names through reaction post association

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
discourse / discourse	affected >= 2026.1.0-latest, < 2026.1.4; affected >= 2026.3.0-latest, < 2026.3.1; affected >= 2026.4.0-latest, < 2026.4.1

CWE

CWE-200

References

https://github.com/discourse/discourse/security/advisories/GHSA-h3mq-9r6w-h33j

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.