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CVE-2026-27151

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, the `move_posts` action only checked `can_move_posts?` on the source topic but never validated write permissions on the destination topic. This allowed TL4 users and category group moderators to move posts into topics in categories where they lack posting privileges (e.g., read-only categories or categories with group-restricted write access). Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:dd9a983ee6673f2358000cd29a1d3cd2ce3d49888e714a6158b3b3f189ec94f9
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":"< 2025.12.2"},{"status":"affected","version":">= 2026.1.0-latest, < 2026.1.1"},{"status":"affected","version":">= 2026.2.0-latest, < 2026.2.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:228fe85b52d11ddc0cb390baf8f6fc7392458d33c3e2d99138f950669f673744 · sha256:ace43e574ad48901… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":1.3,"baseSeverity":"LOW","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:228fe85b52d11ddc0cb390baf8f6fc7392458d33c3e2d99138f950669f673744 · sha256:ace43e574ad48901… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-862","description":"CWE-862: Missing Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:228fe85b52d11ddc0cb390baf8f6fc7392458d33c3e2d99138f950669f673744 · sha256:ace43e574ad48901… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-m69h-9m2g-cfgw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/discourse/discourse/security/advisories/GHSA-m69h-9m2g-cfgw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:228fe85b52d11ddc0cb390baf8f6fc7392458d33c3e2d99138f950669f673744 · sha256:ace43e574ad48901… · /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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