PT-2026-56893 · Discourse · Discourse

CVE-2026-55420

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Published

2026-07-09

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Updated

2026-07-14

CVSS v3.1

8.1

High

VectorAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2026.6.0 Discourse versions prior to 2026.5.1 Discourse versions prior to 2026.4.2 Discourse versions prior to 2026.1.5
Description Under certain non-default configurations, the processing of PDF uploads can be exploited to achieve Remote Code Execution (RCE), which allows an attacker to execute arbitrary commands on the server.
Recommendations Update to version 2026.6.0 Update to version 2026.5.1 Update to version 2026.4.2 Update to version 2026.1.5

Exploit

Fix

RCE

OS Command Injection

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dbugs@ptsecurity.com

Weakness Enumeration

CWE-78

Related Identifiers

BIT-DISCOURSE-2026-55420
CVE-2026-55420
GHSA-7WQ5-JGWW-5RW3

Affected Products

Discourse