High 7.5Published Jul 9, 2026

CVE-2026-55420Discourse: Remote code execution via pdf uploads

Updated under an hour ago (Oct 27, 2026, 10:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-78
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

discourse discourse discourse:discourse (from the name)	from 2026.5.0-latest, < 2026.5.1; from 2026.4.0-latest, < 2026.4.2; from 2026.1.0-latest, < 2026.1.5	CNA record
discourse discourse discourse:discourse	from 2026.1.0 before 2026.1.5; from 2026.4.0 before 2026.4.2; from 2026.5.0 before 2026.5.1; 2026.6.0	NVD

References

References

https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914	x-refsource-misc, patch
https://github.com/discourse/discourse/releases/tag/v2026.1.5	x-refsource-misc, release-notes
https://github.com/discourse/discourse/releases/tag/v2026.4.2	x-refsource-misc, release-notes
https://github.com/discourse/discourse/releases/tag/v2026.5.1	x-refsource-misc, release-notes
https://github.com/discourse/discourse/releases/tag/v2026.6.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.