CVE-2026-27152

LOW

Discourse < 2025.12.2, 2026.1.1, 2026.2.0 - Improper Access Control via Chat::AddUsersToChannel

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 3.8
EPSS 0.0005
EPSS Percentile 14.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-284
Status published
Products (2)
discourse/discourse 2026.2.0
discourse/discourse < 2025.12.2
Published Feb 26, 2026
Tracked Since Feb 27, 2026