{"id":"CVE-2026-111636","kind":"vulnerability","aliases":["CVE-2026-111636"],"related":[],"title":"OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated…","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.","summary":"OpenBMB StaffDeck through 0.5.6 signs session tokens with a hard-coded default app_secret. An unauthenticated attacker can forge an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' and gain full tenant administration, including stored model and channel credentials.","severity":"critical","cvss":9.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["other","self-hosted","staffdeck"],"not_affected_if":["default-config-changed","versions-after-0.5.6"],"how_to_check":"Check whether the app_secret setting still equals the shipped default value. Confirm which StaffDeck version is deployed (0.5.6 and earlier are affected per the sources).","fix":"Set a unique, random app_secret in place of the default, and rotate any model and channel credentials stored in the tenant. A fixed release is not named in the sources; upgrade past 0.5.6 once the vendor publishes one.","status":"open","published_at":"2026-10-16T18:17:44+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","triaged_at":"2026-10-23T22:09:12+00:00","updated_at":"2026-10-23T22:28:55+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-23T22:09:12Z","model":"claude-haiku-5-5","output":{"fix":"Set a unique, random app_secret in place of the default, and rotate any model and channel credentials stored in the tenant. A fixed release is not named in the sources; upgrade past 0.5.6 once the vendor publishes one.","reach":"unknown","impact":"high","summary":"OpenBMB StaffDeck through 0.5.6 signs session tokens with a hard-coded default app_secret. An unauthenticated attacker can forge an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' and gain full tenant administration, including stored model and channel credentials.","category":"other","who_cares":["staffdeck","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker becomes tenant admin and reads stored model and channel credentials","analyst_note":"Find the fixed version and vendor advisory for OpenBMB StaffDeck (check the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-111636 and the project's repository) and confirm whether the default app_secret is the only trigger.","how_to_check":"Check whether the app_secret setting still equals the shipped default value. Confirm which StaffDeck version is deployed (0.5.6 and earlier are affected per the sources).","needs_analyst":true,"not_affected_if":["default-config-changed","versions-after-0.5.6"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000999,"input_tokens":2793,"output_tokens":1439,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-111636':15A,18A '-2026':14A,17A '0.5.6':4A,27B,71C 'admin':52B,105C 'administr':61B,83C,114C 'allow':11A,78C 'app':37B,92C 'attack':41B,80C,94C 'authent':7A,74C 'bypass':8A,75C 'channel':66B,119C 'code':35B,90C 'contain':5A,72C 'credenti':67B,120C 'cve':13A,16A 'default':36B,91C 'demo':56B,109C 'forg':43B,82C 'full':59B,112C 'gain':58B,111C 'hard':34B,89C 'hard-cod':33B,88C 'hmac':46B,99C 'hmac-sha256':45B,98C 'host':22B 'includ':62B,115C 'model':64B,117C 'openbmb':1A,24B,68C 'secret':38B,93C 'seed':51B,104C 'self':21B 'self-host':20B 'session':29B,84C 'sha256':47B,100C 'sign':28B,96C 'staffdeck':2A,23B,25B,69C 'store':63B,116C 'tenant':55B,60B,108C,113C 'token':30B,48B,85C,101C 'unauthent':12A,40B,79C 'use':86C 'user':53B,106C 'vulner':9A,76C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T18:17:44+00:00","kev":null,"cvss_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","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-111636","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111636","severity":null,"published_at":"2026-10-16T18:17:44+00:00","modified_at":"2026-10-16T22:17:21+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}