CVE-2026-33408
Information Disclosure in Discourse Allows Moderators Partial Post Edit Access
Publication date: 2026-03-19
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-862 | The product does not perform an authorization check when an actor attempts to access a resource or perform an action. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability in Discourse, an open-source discussion platform, allowed moderators to see the first 40 characters of post edits in private messages (PMs) and private categories before certain patched versions were released.
It was fixed in versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2.
How can this vulnerability impact me? :
The impact of this vulnerability is limited to a minor confidentiality issue where moderators could view a small portion (first 40 characters) of edited content in private messages and categories.
The CVSS base score of 2.2 indicates a low severity impact, with limited confidentiality impact and no impact on integrity or availability.
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 step.