CVE-2026-55420

HIGH

Discourse: Remote code execution via pdf uploads

Title source: cna
STIX 2.1

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.

Scores

CVSS v3 7.5
EPSS 0.0033
EPSS Percentile 25.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-78
Status published
Products (5)
discourse/discourse 2026.6.0
discourse/discourse 2026.1.0 - 2026.1.5
discourse/discourse >= 2026.1.0-latest, < 2026.1.5
discourse/discourse >= 2026.4.0-latest, < 2026.4.2
discourse/discourse >= 2026.5.0-latest, < 2026.5.1
Published Jul 09, 2026
Tracked Since Jul 09, 2026