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CVE-2026-44782 discourse CVE debrief

CVE-2026-44782 is a vulnerability in Discourse, an open-source discussion platform. The issue involves an incorrect predicate in GroupPostSerializer, leading to unintended serialization of user names. 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 are affected. The vulnerability has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.

Vendor
discourse
Product
Unknown
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-17
Advisory published
2026-06-12
Advisory updated
2026-06-17

Who should care

Users of Discourse, specifically those running 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, should be aware of this vulnerability and take steps to update to a patched version.

Technical summary

The GroupPostSerializer in Discourse incorrectly used the predicate 'include_user_long_name?' instead of 'include_name?'. This mistake led to the serialization of object.user.name regardless of the SiteSetting.enable_names configuration. The CVSS score for this vulnerability is 4.3, indicating a Medium severity.

Defensive priority

Medium

Recommended defensive actions

  • Update to a patched version of Discourse: 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1.

Evidence notes

CVE-2026-44782 was published on 2026-06-12T21:16:21.780Z and has a CVSS score of 4.3. The vulnerability was patched in multiple versions of Discourse.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-44782 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-44782

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-44782 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-44782

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.