CVE-2026-55420 Details
Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, under certain non-default configurations, processing of PDF uploads could be exploited to obtain RCE on the server. This issue is patched in 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
A remote code execution vulnerability has been identified in Discourse, an open-source discussion platform. This issue affects versions prior to 2026.6.0, as well as 2026.5.1, 2026.4.2, and 2026.1.5. Under certain non-default configurations, the processing of PDF uploads could be exploited to execute arbitrary code on the server.
Users can update to Discourse versions 2026.6.0, 2026.5.1, 2026.4.2, or 2026.1.5 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 14, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-78 | Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| discourse discourse | >= 2026.1.0, < 2026.1.5 >= 2026.4.0, < 2026.4.2 >= 2026.5.0, < 2026.5.1 2026.6.0 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | CISA-ADP |
| Jul 13, 2026 | Initial Analysis | [email protected] |
| Jul 9, 2026 | New CVE Received | [email protected] |