Serialization Flaw in Discourse Discussion Platform
CVE-2026-44782

4.3MEDIUM

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
12 June 2026

What is CVE-2026-44782?

A serialization flaw exists in the Discourse discussion platform where the GroupPostSerializer incorrectly declares include_user_long_name? as the predicate for its :name attribute. This mismatch leads to the unintended serialization of object.user.name, regardless of the SiteSetting.enable_names configuration. As a result, sensitive user name data could be revealed. The issue has been addressed in the latest patches, ensuring the correct predicate is now called, thus enhancing user name confidentiality.

Affected Version(s)

discourse >= 2026.1.0-latest, < 2026.1.4 < 2026.1.0-latest, 2026.1.4

discourse >= 2026.3.0-latest, < 2026.3.1 < 2026.3.0-latest, 2026.3.1

discourse >= 2026.4.0-latest, < 2026.4.1 < 2026.4.0-latest, 2026.4.1

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.