CVE-2026-55420
Last modified
CVE-2026-55420 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Discourse | Discourse | >= 2026.1.0, < 2026.1.5 |
| Discourse | Discourse | >= 2026.4.0, < 2026.4.2 |
| Discourse | Discourse | >= 2026.5.0, < 2026.5.1 |
| Discourse | Discourse | 2026.6.0 |
References
- https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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