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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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8d9bf56ab664c03d6824d6747c3664ce3c477122ae29569e132f90c4ef72e968
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"discourse","vendor":"discourse","versions":[{"status":"affected","version":">= 2026.5.0-latest, < 2026.5.1"},{"status":"affected","version":">= 2026.4.0-latest, < 2026.4.2"},{"status":"affected","version":">= 2026.1.0-latest, < 2026.1.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:259d8dffb1d6d9ac0aec222de794accb7c7b702b4a81b80a6d4397e8b9cc3143 · sha256:4a3a27650d4d0a87… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:259d8dffb1d6d9ac0aec222de794accb7c7b702b4a81b80a6d4397e8b9cc3143 · sha256:4a3a27650d4d0a87… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-78","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:259d8dffb1d6d9ac0aec222de794accb7c7b702b4a81b80a6d4397e8b9cc3143 · sha256:4a3a27650d4d0a87… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:259d8dffb1d6d9ac0aec222de794accb7c7b702b4a81b80a6d4397e8b9cc3143 · sha256:4a3a27650d4d0a87… · /containers/cna/references/1
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.1.5","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.1.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:259d8dffb1d6d9ac0aec222de794accb7c7b702b4a81b80a6d4397e8b9cc3143 · sha256:4a3a27650d4d0a87… · /containers/cna/references/2
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.4.2","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.4.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:259d8dffb1d6d9ac0aec222de794accb7c7b702b4a81b80a6d4397e8b9cc3143 · sha256:4a3a27650d4d0a87… · /containers/cna/references/3
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.5.1","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.5.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:259d8dffb1d6d9ac0aec222de794accb7c7b702b4a81b80a6d4397e8b9cc3143 · sha256:4a3a27650d4d0a87… · /containers/cna/references/4
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.6.0","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.6.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:259d8dffb1d6d9ac0aec222de794accb7c7b702b4a81b80a6d4397e8b9cc3143 · sha256:4a3a27650d4d0a87… · /containers/cna/references/5
{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:259d8dffb1d6d9ac0aec222de794accb7c7b702b4a81b80a6d4397e8b9cc3143 · sha256:4a3a27650d4d0a87… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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