What’s Vulnerable › Vulnerabilities
CVE-2026-44780: Discourse: Category queue reviewers can read raw incoming emails from queued posts
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-12 · updated 2026-06-17
- Weakness: CWE-200
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.
Affected products
- discourse: before 2026.1.0; from 2026.1.0 before 2026.1.4; from 2026.3.0 before 2026.3.1; from 2026.4.0 before 2026.4.1; 2026.5.0 — fixed in 2026.1.0, 2026.1.4, 2026.3.1, 2026.4.1
How to fix
Upgrade to a fixed version: discourse 2026.1.0, 2026.1.4, 2026.3.1, 2026.4.1. Check the vendor advisory for mitigations.
References
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