CVE-2026-55420

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.
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*

History

14 Jul 2026, 02:16

Type Values Removed Values Added
References () https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3 - Vendor Advisory, Mitigation () https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3 - Mitigation, Vendor Advisory

13 Jul 2026, 14:33

Type Values Removed Values Added
References () https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914 - () https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914 - Patch
References () https://github.com/discourse/discourse/releases/tag/v2026.1.5 - () https://github.com/discourse/discourse/releases/tag/v2026.1.5 - Release Notes
References () https://github.com/discourse/discourse/releases/tag/v2026.4.2 - () https://github.com/discourse/discourse/releases/tag/v2026.4.2 - Release Notes
References () https://github.com/discourse/discourse/releases/tag/v2026.5.1 - () https://github.com/discourse/discourse/releases/tag/v2026.5.1 - Release Notes
References () https://github.com/discourse/discourse/releases/tag/v2026.6.0 - () https://github.com/discourse/discourse/releases/tag/v2026.6.0 - Release Notes
References () https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3 - () https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3 - Vendor Advisory, Mitigation
CPE cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*
First Time Discourse discourse
Discourse

09 Jul 2026, 18:16

Type Values Removed Values Added
New CVE

Information

Published : 2026-07-09 18:16

Updated : 2026-07-14 02:16


NVD link : CVE-2026-55420

Mitre link : CVE-2026-55420

CVE.ORG link : CVE-2026-55420


JSON object : View

Products Affected

discourse

  • discourse
CWE
CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')