CVE-2026-27152 | THREATINT

Description

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.

PUBLISHED Reserved 2026-02-18 | Published 2026-02-26 | Updated 2026-02-26 | Assigner GitHub_M

LOW: 1.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

Problem types

CWE-284: Improper Access Control

Product status

< 2025.12.2

affected

>= 2026.1.0-latest, < 2026.1.1

affected

>= 2026.2.0-latest, < 2026.2.0

affected

References

github.com/...course/security/advisories/GHSA-f8ff-pxg3-7967

cve.org (CVE-2026-27152)

nvd.nist.gov (CVE-2026-27152)

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