CVE-2026-30891
Authorization Bypass in Discourse User Actions Exposes Private Data
Publication date: 2026-03-20
Last updated on: 2026-03-24
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
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 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
AI Powered Q&A
Can you explain this vulnerability to me?
[{'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]
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
[{'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]