What is CVE-2026-27152?

CVE-2026-27152 is a low-severity vulnerability in Discourse, classified under Improper Access Control. CVSS score: 3.8/10. Published 2026-02-26.

How severe is CVE-2026-27152?

Low severity. CVSS v3 base score is 3.8 out of 10.

Vulnerability in Discourse

CVE-2026-27152

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, DM communication-preference bypass when adding members via `Chat::AddUsersToChannel` — a user could add targets who have blocked/ignored/muted them to an existing DM channel, bypassing per-recipient PM restrictions that are enforced during DM channel creation. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

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

CVSS v3 metric

CVSS v3 base score 3.8 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/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-284 — Improper Access Control

References

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

Frequently asked questions

What is CVE-2026-27152?: CVE-2026-27152 is a low-severity vulnerability in Discourse, classified under Improper Access Control. CVSS score: 3.8/10. Published 2026-02-26.
How severe is CVE-2026-27152?: Low severity. CVSS v3 base score is 3.8 out of 10.