{"id":"CVE-2026-108711","state":"PUBLISHED","title":"Plastic Labs Honcho through 3.3.0 Incorrect Authorization via POST /v3/workspaces","description":"Plastic Labs Honcho through 3.3.0 contains an incorrect authorization vulnerability that allows peer- or session-scoped API key holders to read workspace data because get_or_create_workspace checks only the workspace claim. Attackers can submit their parent workspace name to the POST /v3/workspaces endpoint to retrieve workspace metadata and configuration, including custom_instructions, reserved for workspace or admin keys.","publishedAt":"2026-10-11T12:19:25.400Z","updatedAt":"2026-10-13T17:01:29.798Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["Plastic Labs honcho"],"affected":[{"vendor":"Plastic Labs","product":"honcho","packageURL":"pkg:github/plastic-labs/honcho","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"3.3.0","versionType":"semver"}],"repo":"https://github.com/plastic-labs/honcho"}],"references":["https://hackmd.io/@haind/honcho-scoped-jwt-workspace-config-disclosure","https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/routers/workspaces.py#L41-L72","https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/security.py#L218-L225","https://github.com/plastic-labs/honcho/blob/608aec8a928da13c540262ed980c569448fb53ab/src/crud/workspace.py#L112-L119","https://github.com/plastic-labs/honcho","https://www.vulncheck.com/advisories/plastic-labs-honcho-through-3.3.0-incorrect-authorization-via-post-v3-workspaces"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/108xxx/CVE-2026-108711.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-108711","state":"PUBLISHED","datePublished":"2026-10-11T12:19:25.400Z","dateUpdated":"2026-10-13T17:01:29.798Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-11T01:51:09.941Z"},"containers":{"cna":{"title":"Plastic Labs Honcho through 3.3.0 Incorrect Authorization via POST /v3/workspaces","descriptions":[{"lang":"en","value":"Plastic Labs Honcho through 3.3.0 contains an incorrect authorization vulnerability that allows peer- or session-scoped API key holders to read workspace data because get_or_create_workspace checks only the workspace claim. 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