UpHeron
All vulnerabilities

Servers and applications

CVE-2026-55420

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.

Severity
High 8.1
Published
9 Jul 2026
Last changed
14 Jul 2026
Added to UpHeron
21 Oct 2026
Fixed in
2026.1.5, 2026.4.2, 2026.5.1
Sources
NVD

Affected software

SoftwareAffected versions
DiscourseServers and applications · cpe:a: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
  • Version 2026.6.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-55420
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-55420