CVE-2026-55420

highCVSS 7.5covered by 1 sourcefirst seen 2026-07-09

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.

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Exploitation outlook

Low exploitation risk0.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-55420: Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 20…nvd · 2026-07-09

External references

NVD record for CVE-2026-55420

CVE.org record

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