CVE-2026-27935 Discourse — Exploit & Vulnerability Details MEDIUM

Parameter	Value
CVSS	6.9 (MEDIUM)
Affected Versions	2026.1.0 — 2026.2.1
Fixed In	2026.1.2
Type	CWE-201
Vendor	Discourse
Public PoC	No

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a vulnerability in an API endpoint that discloses private topic metadata of admin users to moderator users even if the moderators do not have access to the private topics. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch.

No known workarounds are available.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

Low

Easy to exploit

Attack Requirements

None

No additional conditions

Privileges Required

High

Admin privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

High

Complete data leak

Integrity

None

No data modification

Availability

None

No disruption

CVSS Vector v4.0

Weakness Type (CWE)

CWE-201

Vulnerable Products 3

Configuration	From (including)	Up to (excluding)
Discourse Discourse cpe:2.3:a:discourse:discourse::::::::	`2026.1.0`	`2026.1.2`
Discourse Discourse cpe:2.3:a:discourse:discourse::::::::	`2026.2.0`	`2026.2.1`
Discourse Discourse cpe:2.3:a:discourse:discourse:2026.3.0::::latest:::	—	—