What is CVE-2026-27153?

CVE-2026-27153 is a low-severity vulnerability in Discourse, classified under Incorrect Authorization. CVSS score: 2.7/10. Published 2026-02-26.

How severe is CVE-2026-27153?

Low severity. CVSS v3 base score is 2.7 out of 10.

Auth bypass in Discourse

CVE-2026-27153

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.

Vulnerability class: Broken Access Control

EPSS: 0.002 (5.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N.

Affected products

Discourse — versions >= 2026.2.0-latest, < 2026.2.0, >= 2026.1.0-latest, < 2026.1.1, 2026.2.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-27153?: CVE-2026-27153 is a low-severity vulnerability in Discourse, classified under Incorrect Authorization. CVSS score: 2.7/10. Published 2026-02-26.
How severe is CVE-2026-27153?: Low severity. CVSS v3 base score is 2.7 out of 10.