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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
discourse discourse affected
Version Status Constraints
>= 2026.5.0-latest, < 2026.5.1 affected —
>= 2026.4.0-latest, < 2026.4.2 affected —
>= 2026.1.0-latest, < 2026.1.5 affected —

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Discourse Subscribe
Discourse Subscribe

Project Subscriptions

Vendors Products
Discourse Subscribe
Discourse Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914 cve-icon
https://github.com/discourse/discourse/releases/tag/v2026.1.5 cve-icon
https://github.com/discourse/discourse/releases/tag/v2026.4.2 cve-icon
https://github.com/discourse/discourse/releases/tag/v2026.5.1 cve-icon
https://github.com/discourse/discourse/releases/tag/v2026.6.0 cve-icon
https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3 cve-icon
History

Thu, 09 Jul 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Discourse
Discourse discourse
Vendors & Products Discourse
Discourse discourse

Thu, 09 Jul 2026 18:00:00 +0000

Type Values Removed Values Added
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.
Title Discourse: Remote code execution via pdf uploads
Weaknesses CWE-78
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-09T17:54:07.940Z

Reserved: 2026-06-16T21:48:43.125Z

Link: CVE-2026-55420

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-09T19:30:17Z

Weaknesses