CVE-2026-27936
Restriction Bypass in Discourse Exposes Post Action Counts
Publication date: 2026-03-19
Last updated on: 2026-03-23
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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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-863 | The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects the Discourse open-source discussion platform. Before certain fixed versions, it allowed non-privileged users to bypass restrictions and view restricted post action counts by sending a specially crafted request.
How can this vulnerability impact me? :
The impact of this vulnerability is that unauthorized users can access information about restricted post action counts, which could lead to information disclosure and potentially aid in further attacks or misuse of the platform.
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?
To mitigate this vulnerability, you should upgrade your Discourse installation to one of the patched versions: 2026.3.0-latest.1, 2026.2.1, or 2026.1.2.
No known workarounds are available, so applying the patch by upgrading is the immediate recommended action.