CVE-2026-55420

High

Open

TLP:CLEAR

Discourse: Remote code execution via pdf uploads

NVD CVE.org

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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.

Details

CVSS Score: 7.5
EPSS Score ⓘ: 0.35%

27.7th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Confidence: 90%
Published: Jul 9, 2026
Last Modified: Jul 14, 2026

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