Discourse: Category queue reviewers can read raw incoming emails from queued posts
CVE-2026-44780

4.3MEDIUM

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
12 June 2026

What is CVE-2026-44780?

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.

Affected Version(s)

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

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

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

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

.