What is the CVSS score of CVE-2026-33410?

CVE-2026-33410 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Discourse are affected by CVE-2026-33410?

Organizations using Discourse should be aware of moderate risk from CVE-2026-33410, a incorrect authorization vulnerability rated CVSS 5.4. Attackers could gain access beyond their authorized level.

How to fix or mitigate CVE-2026-33410?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Discourse CVE-2026-33410

MEDIUM

Incorrect Authorization (CWE-863)

2026-03-19 security-advisories@github.com

Authentication Bypass Discourse

5.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.4 MEDIUM

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 19, 2026 - 22:30 vuln.today

CVE Published

Mar 19, 2026 - 22:16 nvd

MEDIUM 5.4

DescriptionGitHub Advisory

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have two authorization issues in the chat direct message API. First, when creating a direct message channel or adding users to an existing one, the target_groups parameter was passed directly to the user resolution query without checking group or member visibility for the acting user. An authenticated chat user could craft an API request with a known private/hidden group name and receive a channel containing that group's members, leaking their identities. Second, can_chat? only checked group membership, not the chat_enabled user preference. A chat-disabled user could create or query DM channels between other users via the direct messages API, potentially exposing private last_message content from the serialized channel response. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.