CVE-2026-30891

Received Received - Intake

Authorization Bypass in Discourse User Actions Exposes Private Data

Publication date: 2026-03-20

Last updated on: 2026-03-24

Assigner: GitHub, Inc.

Description

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a user could access another user's private activity due to insufficient authorization checks in the user actions endpoint. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-03-20

Last Modified

2026-03-24

Generated

2026-07-06

AI Q&A

2026-03-20

EPSS Evaluated

2026-07-05

NVD

CVE-2026-30891

EUVD

EUVD-2026-13492

Affected Vendors & Products

Vendor	Product	Version / Range
discourse	discourse	From 2026.1.0 (inc) to 2026.1.2 (exc)
discourse	discourse	From 2026.2.0 (inc) to 2026.2.1 (exc)
discourse	discourse	2026.3.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-30891 is a moderate severity vulnerability in the Discourse software that occurs due to insufficient authorization checks in the user actions endpoint.'}, {'type': 'paragraph', 'content': "This flaw allows a user to access another user's private activity types without proper permission, leading to unauthorized exposure of private user action data."}, {'type': 'paragraph', 'content': 'The issue affects Discourse versions prior to 2026.1.2, 2026.2.1, and 2026.3.0-latest.1, where patches have been applied to fix the problem.'}] [1]

Impact Analysis

This vulnerability can impact you by allowing unauthorized users to access your private activity data on the Discourse platform.

Such unauthorized access compromises user privacy and may expose sensitive information related to user actions.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

[{'type': 'paragraph', 'content': 'To mitigate this vulnerability, you should upgrade your Discourse installation to one of the patched versions: 2026.1.2, 2026.2.1, or 2026.3.0-latest.1.'}, {'type': 'paragraph', 'content': "These versions contain the necessary patches that fix the insufficient authorization checks in the user actions endpoint, preventing unauthorized access to other users' private activity data."}] [1]

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