Auth bypass in Discourse

CVE-2026-33408

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, moderators were able to see the first 40 characters of post edits in PMs and private categories. Versions 2026.3.0-latest.1, 2026…

Vulnerability class: Broken Access Control

EPSS: 0.000 (2.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.2 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N.

Affected products

  • Discourse — versions >= 2026.1.0-latest, < 2026.1.2, >= 2026.2.0-latest, < 2026.2.1, = 2026.3.0-latest

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-33408?
CVE-2026-33408 is a low-severity vulnerability in Discourse, classified under Missing Authorization. CVSS score: 2.2/10. Published 2026-03-19.
How severe is CVE-2026-33408?
Low severity. CVSS v3 base score is 2.2 out of 10.