{"id":"CVE-2026-111636","aliases":["EUVD-2026-103058","GHSA-m82j-2j7c-gx6q"],"status":"published","title":"OpenBMB StaffDeck through 0.5.6 Authentication Bypass via Hard-Coded Session Secret","description":"OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge administrator session tokens using the hard-coded default app_secret. Attackers can sign an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' to gain full tenant administration, including stored model and channel credentials.","severity":{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00402,"percentile":0.34931,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-321"],"published":"2026-10-16T17:39:08Z","modified":"2026-10-28T02:31:01Z","products":[{"vendor":"openbmb","product":"staffdeck"}],"references":[{"url":"https://hackmd.io/@hieuPenguinnn/staffdeck-default-token-signing-secret-auth-bypass","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/config.py#L10","tags":["technical-description","article"]},{"url":"https://github.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/security/auth.py#L96-L98","tags":["technical-description","article"]},{"url":"https://www.vulncheck.com/advisories/openbmb-staffdeck-through-0.5.6-authentication-bypass-via-hard-coded-session-secret","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111636","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-m82j-2j7c-gx6q"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111636.json","tags":["advisory"]},{"url":"https://github.com/OpenBMB/StaffDeck","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-111636","title":"OpenBMB StaffDeck through 0.5.6 Authentication Bypass via Hard-Coded Session Secret","description":"OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge administrator session tokens using the hard-coded default app_secret. Attackers can sign an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' to gain full tenant administration, including stored model and channel credentials.","status":"published","published":"2026-10-16T17:39:08.257Z","modified":"2026-10-16T21:19:00.346Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-321"],"updated_at":"2026-11-02T14:20:15.34316Z"}],"euvd":[{"id":"EUVD-2026-103058","description":"OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge administrator session tokens using the hard-coded default app_secret. Attackers can sign an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' to gain full tenant administration, including stored model and channel credentials.","status":"published","published":"2026-10-16T17:39:08Z","modified":"2026-10-16T21:19:00Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-02T17:00:01.37578Z"}],"ghsa":[{"id":"GHSA-m82j-2j7c-gx6q","title":"OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows...","description":"OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge administrator session tokens using the hard-coded default app_secret. Attackers can sign an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' to gain full tenant administration, including stored model and channel credentials.","status":"published","published":"2026-10-16T18:34:45Z","modified":"2026-10-16T18:34:51Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"}],"cwes":["CWE-321"],"updated_at":"2026-11-02T15:13:52.326136Z"}],"nvd":[{"id":"CVE-2026-111636","description":"OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge administrator session tokens using the hard-coded default app_secret. Attackers can sign an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' to gain full tenant administration, including stored model and channel credentials.","status":"published","published":"2026-10-16T18:17:44.01Z","modified":"2026-10-16T22:17:21.39Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-321"],"updated_at":"2026-11-02T14:13:00.123071Z"}],"osv":[{"id":"CVE-2026-111636","title":"OpenBMB StaffDeck through 0.5.6 Authentication Bypass via Hard-Coded Session Secret","description":"OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge administrator session tokens using the hard-coded default app_secret. Attackers can sign an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' to gain full tenant administration, including stored model and channel credentials.","status":"published","published":"2026-10-16T17:39:08.257Z","modified":"2026-10-28T02:31:01.425516438Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-321"],"updated_at":"2026-11-02T15:44:55.938017Z"}]}}