Discourse Deleted Posts Auth Bypass Fixed in 2026.3.0-latest.1
CVE-2026-33428 Published on March 20, 2026
Discourse Allows Unauthorized Access to Deleted Posts Index via Group Membership
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a non-staff user with elevated group membership could access deleted posts belonging to any user due to an overly broad authorization check on the deleted posts index endpoint. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Vulnerability Analysis
CVE-2026-33428 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-33428 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-33428
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Affected Versions
discourse:- Version = 2026.3.0-latest is affected.
- Version >= 2026.2.0-latest, < 2026.2.1 is affected.
- Version >= 2026.1.0-latest, < 2026.1.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.