CVE-2026-44782

MEDIUM

Discourse: GroupPostSerializer leaks hidden full names through reaction post association

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v3 4.3
EPSS 0.0018
EPSS Percentile 7.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (3)
discourse/discourse >= 2026.1.0-latest, < 2026.1.4
discourse/discourse >= 2026.3.0-latest, < 2026.3.1
discourse/discourse >= 2026.4.0-latest, < 2026.4.1
Published Jun 12, 2026
Tracked Since Jun 13, 2026