{"id":"CVE-2026-127079","kind":"vulnerability","aliases":["CVE-2026-127079"],"related":[],"title":"OpsTree BuildPiper: missing rate limit lets attackers brute-force password reset codes","description":"OpsTree BuildPiper before 2.7.0 lacks rate limiting on password-reset OTP verification, allowing unauthenticated attackers to brute force 6-digit OTPs. Attackers can initiate a reset and submit unthrottled guesses to the check_otp endpoint, resetting the target's password and taking over the account.","summary":"OpsTree BuildPiper before 2.7.0 does not limit how many password-reset one-time codes can be tried. An unauthenticated attacker can guess the 6-digit code at the check_otp endpoint and reset a victim's password, taking over the account.","severity":"critical","cvss":9.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["buildpiper","other","self-hosted"],"not_affected_if":["version-2.7.0-or-later"],"how_to_check":"- Check the installed BuildPiper version against the fixed version in the sources (unknown in the sources).\n- Confirm whether the password-reset flow is reachable from the internet, since the sources do not say.","fix":"- BuildPiper: upgrade to `2.7.0` or later (per the advisory's 'before 2.7.0' range).","status":"open","published_at":"2026-11-13T10:18:04+00:00","first_seen_at":"2026-11-13T10:47:29+00:00","triaged_at":"2026-11-13T10:48:41+00:00","updated_at":"2026-11-13T10:48:41+00:00","category":"other","confidence":0.7,"triage":{"at":"2026-11-13T10:48:41Z","model":"claude-haiku-5-5","output":{"fix":"- BuildPiper: upgrade to `2.7.0` or later (per the advisory's 'before 2.7.0' range).","reach":"internet","title":"OpsTree BuildPiper: missing rate limit lets attackers brute-force password reset codes","impact":"high","summary":"OpsTree BuildPiper before 2.7.0 does not limit how many password-reset one-time codes can be tried. An unauthenticated attacker can guess the 6-digit code at the check_otp endpoint and reset a victim's password, taking over the account.","audience":"businesses","category":"other","nicknames":[],"who_cares":["buildpiper","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"attacker resets any user's password and takes over the account","analyst_note":"Confirm the affected product ranges and the exact fixed version from the vendor advisory or the VulnCheck page; the sources give only 'before 2.7.0'.","how_to_check":"- Check the installed BuildPiper version against the fixed version in the sources (unknown in the sources).\n- Confirm whether the password-reset flow is reachable from the internet, since the sources do not say.","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["version-2.7.0-or-later"],"who_is_affected":"BuildPiper versions before 2.7.0 with the password-reset OTP flow enabled are exposed. Instances where the reset endpoint is not reachable by outside users are less exposed; the sources do not say more.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000741,"input_tokens":4596,"output_tokens":563,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-127079':16A,19A '-2026':15A,18A '2.7.0':28B,71C '6':50B,87C 'account':67B,113C 'allow':81C 'attack':7A,46B,83C,90C 'brute':9A,85C 'brute-forc':8A 'buildpip':2A,20B,26B,69C 'check':55B,101C 'code':13A,40B,52B 'cve':14A,17A 'digit':51B,88C 'endpoint':57B,103C 'forc':10A,86C 'guess':48B,98C 'host':24B 'initi':92C 'lack':72C 'let':6A 'limit':5A,31B,74C 'mani':33B 'miss':3A 'one':38B 'one-tim':37B 'opstre':1A,25B,68C 'otp':56B,79C,89C,102C 'password':11A,35B,63B,77C,108C 'password-reset':34B,76C 'rate':4A,73C 'reset':12A,36B,59B,78C,94C,104C 'self':23B 'self-host':22B 'submit':96C 'take':64B,110C 'target':106C 'time':39B 'tri':43B 'unauthent':45B,82C 'unthrottl':97C 'verif':80C 'victim':61B","nicknames":[],"mitigations":[],"who_affected":"BuildPiper versions before 2.7.0 with the password-reset OTP flow enabled are exposed. Instances where the reset endpoint is not reachable by outside users are less exposed; the sources do not say more.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["buildpiper","critical","other","selfhosted"],"campaign_type":null,"search_a":"'-127079':16A,19A '-2026':15A,18A 'attack':7A 'brute':9A 'brute-forc':8A 'buildpip':2A 'code':13A 'cve':14A,17A 'forc':10A 'let':6A 'limit':5A 'miss':3A 'opstre':1A 'password':11A 'rate':4A 'reset':12A","search_b":"'2.7.0':28B '6':50B 'account':67B 'attack':46B 'buildpip':20B,26B 'check':55B 'code':40B,52B 'digit':51B 'endpoint':57B 'guess':48B 'host':24B 'limit':31B 'mani':33B 'one':38B 'one-tim':37B 'opstre':25B 'otp':56B 'password':35B,63B 'password-reset':34B 'reset':36B,59B 'self':23B 'self-host':22B 'take':64B 'time':39B 'tri':43B 'unauthent':45B 'victim':61B","search_c":"'2.7.0':71C '6':87C 'account':113C 'allow':81C 'attack':83C,90C 'brute':85C 'buildpip':69C 'check':101C 'digit':88C 'endpoint':103C 'forc':86C 'guess':98C 'initi':92C 'lack':72C 'limit':74C 'opstre':68C 'otp':79C,89C,102C 'password':77C,108C 'password-reset':76C 'rate':73C 'reset':78C,94C,104C 'submit':96C 'take':110C 'target':106C 'unauthent':82C 'unthrottl':97C 'verif':80C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T10:18:04+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/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-2026-127079","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-127079","severity":null,"published_at":"2026-11-13T10:18:04+00:00","modified_at":"2026-11-13T10:18:04+00:00","first_seen_at":"2026-11-13T10:47:29+00:00","fetched_at":"2026-11-13T10:47:29+00:00","note":null}],"documents":[{"id":145283,"url":"https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-otp-brute-force-via-password-reset-check-otp","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}