PT-2026-22187 · Discourse · Discourse

Davidtaylorhq · Published 2026-02-26 · Updated 2026-03-03 · CVE-2026-27152

Positive Technologies (AI Summary)

CVSS v3.1

3.8

Low

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2025.12.2 Discourse versions prior to 2026.1.1 Discourse versions prior to 2026.2.0

Description Discourse, an open source discussion platform, had a flaw where a user could add targets who had blocked, ignored, or muted them to an existing direct message (DM) channel. This bypassed per-recipient private message restrictions normally enforced when creating DM channels. The issue occurred when adding members via the Chat::AddUsersToChannel function.

Recommendations Upgrade to Discourse version 2025.12.2 or later. Upgrade to Discourse version 2026.1.1 or later. Upgrade to Discourse version 2026.2.0 or later.

Exploit

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

BIT-DISCOURSE-2026-27152

CVE-2026-27152

GHSA-F8FF-PXG3-7967

Affected Products

Discourse

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27152.json · Exploit
• https://github.com/discourse/discourse/security/advisories/GHSA-f8ff-pxg3-7967 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27152 · Security Note
• https://osv.dev/vulnerability/CVE-2026-27152 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-discourse-2026-27152 · Vendor Advisory
• https://twitter.com/CVEnew/status/2027466661750837295 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2027259688002240772 · Twitter Post
• https://t.me/CVEtracker/45872 · Telegram Post
• https://twitter.com/infoflowcloud/status/2027467862739206486 · Twitter Post