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CVE-2026-55420

HIGH
7.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-55420
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-16 21:48 UTC
Published
2026-07-09 17:54 UTC
Last updated
2026-07-09 17:54 UTC
Primary CWE
CWE-78
CWE-78: Improper Neutralization of Special Elements used in …
Vendor / Product
discourse / discourse
Sources
cve.org  ·  NVD

Severity & Metrics

7.5 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products (1)
VendorProductPlatformVersions
discourse discourse — >= 2026.5.0-latest, < 2026.5.1, >= 2026.4.0-latest, < 2026.4.2, >= 2026.1.0-latest, < 2026.1.5
Weakness (CWE)
CWESourceDescription
CWE-78 cna CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS scores (1)
ScoreSeverityVersionSourceVector
7.5 HIGH 3.1 cna CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
References (6)
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