{"id":"CVE-2026-127077","kind":"vulnerability","aliases":["CVE-2026-127077"],"related":[],"title":"OpsTree BuildPiper: authenticated users can deploy to other projects' Kubernetes clusters","description":"OpsTree BuildPiper before 2.7.0 contains an authorization bypass vulnerability that allows authenticated users to create environments on unassigned Kubernetes clusters by tampering with cluster_id and namespaces values. Attackers can modify requests to POST /api/v1/project/{project_id}/env/ to target another project's cluster, then trigger builds and deployments into it, bypassing project isolation.","summary":"OpsTree BuildPiper before 2.7.0 lets a logged-in user create environments on Kubernetes clusters that belong to another project by changing the cluster_id and namespaces values in a request. The attacker can then trigger builds and deployments into that foreign cluster, bypassing project isolation.","severity":"high","cvss":7.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["buildpiper","ci-cd","infrastructure","kubernetes","self-hosted"],"not_affected_if":["dedicated-clusters-per-project","single-project-instance"],"how_to_check":"- Check the installed BuildPiper version; versions below `2.7.0` are in scope.\n- Review whether multiple projects share BuildPiper and the same Kubernetes clusters.","fix":"- BuildPiper: upgrade to `2.7.0` or later.","status":"open","published_at":"2026-11-13T10:18:03+00:00","first_seen_at":"2026-11-13T10:47:29+00:00","triaged_at":"2026-11-13T10:52:50+00:00","updated_at":"2026-11-13T10:52:50+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-11-13T10:52:50Z","model":"claude-haiku-5-5","output":{"fix":"- BuildPiper: upgrade to `2.7.0` or later.","reach":"network","title":"OpsTree BuildPiper: authenticated users can deploy to other projects' Kubernetes clusters","impact":"high","summary":"OpsTree BuildPiper before 2.7.0 lets a logged-in user create environments on Kubernetes clusters that belong to another project by changing the cluster_id and namespaces values in a request. The attacker can then trigger builds and deployments into that foreign cluster, bypassing project isolation.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["buildpiper","kubernetes","self-hosted","ci-cd"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"Authenticated user deploys workloads into another project's Kubernetes cluster","analyst_note":"Confirm the fixed version and whether the advisory at vulncheck.com names additional affected setups; sources give only the 2.7.0 boundary.","how_to_check":"- Check the installed BuildPiper version; versions below `2.7.0` are in scope.\n- Review whether multiple projects share BuildPiper and the same Kubernetes clusters.\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["single-project-instance","dedicated-clusters-per-project"],"who_is_affected":"Teams that run self-hosted BuildPiper with several projects deploying to shared Kubernetes clusters are exposed, since any authenticated user can target another project's cluster. Single-project installations or setups where each project has its own clusters have less exposure. The sources do not describe further configuration conditions.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000771,"input_tokens":4615,"output_tokens":618,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-127077':14A,17A '-2026':13A,16A '/api/v1/project':107C '/env':110C '2.7.0':30B,76C 'allow':83C 'anoth':45B,113C 'attack':59B,101C 'authent':3A,84C 'author':79C 'belong':43B 'build':63B,119C 'buildpip':2A,18B,28B,74C 'bypass':70B,80C,124C 'cd':21B 'chang':48B 'ci':20B 'ci-cd':19B 'cluster':11A,41B,50B,69B,92C,96C,116C 'contain':77C 'creat':37B,87C 'cve':12A,15A 'deploy':6A,65B,121C 'environ':38B,88C 'foreign':68B 'host':26B 'id':51B,97C,109C 'infrastructur':22B 'isol':72B,126C 'kubernet':10A,23B,40B,91C 'let':31B 'log':34B 'logged-in':33B 'modifi':103C 'namespac':53B,99C 'opstre':1A,27B,73C 'post':106C 'project':9A,46B,71B,108C,114C,125C 'request':57B,104C 'self':25B 'self-host':24B 'tamper':94C 'target':112C 'trigger':62B,118C 'unassign':90C 'user':4A,36B,85C 'valu':54B,100C 'vulner':81C","nicknames":[],"mitigations":[],"who_affected":"Teams that run self-hosted BuildPiper with several projects deploying to shared Kubernetes clusters are exposed, since any authenticated user can target another project's cluster. Single-project installations or setups where each project has its own clusters have less exposure. The sources do not describe further configuration conditions.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["buildpiper","cicd","high","infrastructure","kubernetes","selfhosted"],"campaign_type":null,"search_a":"'-127077':14A,17A '-2026':13A,16A 'authent':3A 'buildpip':2A 'cluster':11A 'cve':12A,15A 'deploy':6A 'kubernet':10A 'opstre':1A 'project':9A 'user':4A","search_b":"'2.7.0':30B 'anoth':45B 'attack':59B 'belong':43B 'build':63B 'buildpip':18B,28B 'bypass':70B 'cd':21B 'chang':48B 'ci':20B 'ci-cd':19B 'cluster':41B,50B,69B 'creat':37B 'deploy':65B 'environ':38B 'foreign':68B 'host':26B 'id':51B 'infrastructur':22B 'isol':72B 'kubernet':23B,40B 'let':31B 'log':34B 'logged-in':33B 'namespac':53B 'opstre':27B 'project':46B,71B 'request':57B 'self':25B 'self-host':24B 'trigger':62B 'user':36B 'valu':54B","search_c":"'/api/v1/project':107C '/env':110C '2.7.0':76C 'allow':83C 'anoth':113C 'attack':101C 'authent':84C 'author':79C 'build':119C 'buildpip':74C 'bypass':80C,124C 'cluster':92C,96C,116C 'contain':77C 'creat':87C 'deploy':121C 'environ':88C 'id':97C,109C 'isol':126C 'kubernet':91C 'modifi':103C 'namespac':99C 'opstre':73C 'post':106C 'project':108C,114C,125C 'request':104C 'tamper':94C 'target':112C 'trigger':118C 'unassign':90C 'user':85C 'valu':100C 'vulner':81C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T10:18:03+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/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-2026-127077","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-127077","severity":null,"published_at":"2026-11-13T10:18:03+00:00","modified_at":"2026-11-13T10:18:03+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":145281,"url":"https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-authorization-bypass-via-environment-creation-api","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"}