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CVE-2026-55420Discourse: Remote code execution via pdf uploads
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.
8.1 HIGHEPSS 0.60%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.1 | HIGH | 3.1NVD | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 7.5 | HIGH | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Details
- CVE ID
- CVE-2026-55420
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 9, 2026
- Last modified
- 2026-07-14 02:16 UTC
- Weaknesses
- CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Products
As published by the CNA in the CVE record.
discoursediscourse3 version ranges
- >= 2026.5.0-latest, < 2026.5.1
- >= 2026.4.0-latest, < 2026.4.2
- >= 2026.1.0-latest, < 2026.1.5
References
- github.com https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914
- github.com https://github.com/discourse/discourse/releases/tag/v2026.1.5
- github.com https://github.com/discourse/discourse/releases/tag/v2026.4.2
- github.com https://github.com/discourse/discourse/releases/tag/v2026.5.1
- github.com https://github.com/discourse/discourse/releases/tag/v2026.6.0
- github.com https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3