CVE-2026-44780
Received Received - Intake
Information Disclosure in Discourse via Email Payload

Publication date: 2026-06-12

Last updated on: 2026-06-12

Assigner: GitHub, Inc.

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, ReviewableQueuedPostSerializer unconditionally included payload["raw_email"] for posts that arrived via incoming email. Category moderation group members reaching the review queue could therefore read the full inbound email source (headers, sender trace, MUA, body) without being in view_raw_email_allowed_groups — the trust boundary that gates the dedicated raw-email endpoint. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.
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Meta Information
Published
2026-06-12
Last Modified
2026-06-12
Generated
2026-06-13
AI Q&A
2026-06-13
EPSS Evaluated
N/A
NVD
CVE-2026-44780
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
discourse discourse From 2026.1.0 (inc) to 2026.1.4 (exc)
discourse discourse From 2026.3.0 (inc) to 2026.3.1 (exc)
discourse discourse From 2026.4.0 (inc) to 2026.4.1 (exc)
discourse discourse 2026.1.4
discourse discourse 2026.3.1
discourse discourse 2026.4.1
discourse discourse 2026.5.0-latest.1
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
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Executive Summary

This vulnerability affects the Discourse open-source discussion platform in certain versions before 2026.1.4, 2026.3.1, and 2026.4.1. The issue is that the ReviewableQueuedPostSerializer component included the full raw email content (including headers, sender trace, mail user agent, and body) for posts that arrived via incoming email without proper access control. This means that members of category moderation groups who could access the review queue were able to see the full inbound email source even if they were not part of the groups allowed to view raw emails, bypassing the intended trust boundary.

Impact Analysis

The vulnerability can lead to unauthorized disclosure of sensitive email information to category moderators who should not have access to the full raw email content. This could expose private or confidential information contained in inbound emails, potentially leading to privacy breaches or information leakage within the organization or community using Discourse.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade your Discourse installation to one of the patched versions: 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1.

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