What’s Vulnerable › Vulnerabilities
CVE-2026-27153: Discourse doesn't prevent moderators from exporting user Chat DMs
- Severity: low (CVSS 2.7 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: 2026-02-26 · updated 2026-06-17
- Weakness: CWE-863
Description
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, moderators could export user Chat DMs via the CSV export endpoint by exploiting an overly permissive allowlist in `can_export_entity?`. The method allowed moderators to export any entity not explicitly blocked instead of restricting to an explicit allowlist. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Affected products
- discourse: before 2025.12.2; from 2026.1.0 before 2026.1.1; 2026.2.0 — fixed in 2025.12.2, 2026.1.1
How to fix
Upgrade to a fixed version: discourse 2025.12.2, 2026.1.1. Check the vendor advisory for mitigations.
References
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