{"id":"CVE-2026-122307","kind":"vulnerability","aliases":["CVE-2026-122307"],"related":[],"title":"Kyverno: namespaced PolicyException rights let users bypass cluster-wide policy","description":"Kyverno before 1.19.2 contains a policy bypass vulnerability in the admissionpolicygenerator controller, which folds PolicyExceptions into generated ValidatingAdmissionPolicies while ignoring the --enablePolicyException, --exceptionNamespace, and policy kind gates. Users with namespaced create rights on PolicyExceptions can inject negated matchConditions into the generated policies to admit violating resources, bypassing cluster-wide enforcement.","summary":"Kyverno before 1.19.2 folds PolicyExceptions into generated ValidatingAdmissionPolicies while ignoring its own enablement and namespace gates. A user with namespaced create rights on PolicyExceptions can inject negated matchConditions, so violating resources are admitted despite cluster-wide enforcement.","severity":"high","cvss":8.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["kubernetes","kyverno","package","policy-as-code"],"not_affected_if":["kyverno-1.19.2-or-later","no-policyexception-create-rights"],"how_to_check":"- Check the installed Kyverno version with `kubectl get deploy -n kyverno kyverno-admission-controller -o jsonpath='{.spec.template.spec.containers[0].image}'`\n- Review who holds create rights on PolicyException resources with `kubectl auth can-i create policyexceptions -n <namespace>` across namespaces\n- Confirm whether the admissionpolicygenerator controller is in use (generated ValidatingAdmissionPolicies present)","fix":"- Kyverno: move to `1.19.2` or later (fixed version from the advisory)","status":"open","published_at":"2026-11-05T03:17:22+00:00","first_seen_at":"2026-11-05T03:31:41+00:00","triaged_at":"2026-11-05T03:33:20+00:00","updated_at":"2026-11-05T03:33:20+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-05T03:33:20Z","model":"claude-haiku-5-5","output":{"fix":"- Kyverno: move to `1.19.2` or later (fixed version from the advisory)","reach":"network","title":"Kyverno: namespaced PolicyException rights let users bypass cluster-wide policy","impact":"high","summary":"Kyverno before 1.19.2 folds PolicyExceptions into generated ValidatingAdmissionPolicies while ignoring its own enablement and namespace gates. A user with namespaced create rights on PolicyExceptions can inject negated matchConditions, so violating resources are admitted despite cluster-wide enforcement.","audience":"businesses","category":"package","nicknames":[],"who_cares":["kyverno","kubernetes","policy-as-code"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"Violating workloads are admitted past cluster-wide admission policy","analyst_note":"","how_to_check":"- Check the installed Kyverno version with `kubectl get deploy -n kyverno kyverno-admission-controller -o jsonpath='{.spec.template.spec.containers[0].image}'`\n- Review who holds create rights on PolicyException resources with `kubectl auth can-i create policyexceptions -n <namespace>` across namespaces\n- Confirm whether the admissionpolicygenerator controller is in use (generated ValidatingAdmissionPolicies present)","plain_action":"","needs_analyst":false,"not_affected_if":["kyverno-1.19.2-or-later","no-policyexception-create-rights"],"who_is_affected":"Clusters running Kyverno below 1.19.2 where some users can create PolicyException resources in a namespace. Clusters without Kyverno, or where PolicyException creation is restricted to trusted admins, are less exposed. Teams that do not use the admission policy generator controller should still confirm the version.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000768,"input_tokens":4331,"output_tokens":669,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-122307':14A,17A '-2026':13A,16A '1.19.2':27B,65C 'admissionpolicygener':73C 'admit':57B,106C 'bypass':7A,69C,109C 'cluster':9A,60B,111C 'cluster-wid':8A,59B,110C 'code':24B 'contain':66C 'control':74C 'creat':45B,93C 'cve':12A,15A 'despit':58B 'enabl':37B 'enablepolicyexcept':84C 'enforc':62B,113C 'exceptionnamespac':85C 'fold':28B,76C 'gate':40B,89C 'generat':31B,79C,103C 'ignor':34B,82C 'inject':50B,98C 'kind':88C 'kubernet':18B 'kyverno':1A,19B,25B,63C 'let':5A 'matchcondit':52B,100C 'namespac':2A,39B,44B,92C 'negat':51B,99C 'packag':20B 'polici':11A,22B,68C,87C,104C 'policy-as-cod':21B 'policyexcept':3A,29B,48B,77C,96C 'resourc':55B,108C 'right':4A,46B,94C 'user':6A,42B,90C 'validatingadmissionpolici':32B,80C 'violat':54B,107C 'vulner':70C 'wide':10A,61B,112C","nicknames":[],"mitigations":[],"who_affected":"Clusters running Kyverno below 1.19.2 where some users can create PolicyException resources in a namespace. Clusters without Kyverno, or where PolicyException creation is restricted to trusted admins, are less exposed. Teams that do not use the admission policy generator controller should still confirm the version.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","kubernetes","kyverno","package","policyascode"],"campaign_type":null,"first_public_at":"2026-10-21T15:43:08+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/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-2026-122307","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122307","severity":null,"published_at":"2026-11-05T03:17:22+00:00","modified_at":"2026-11-05T03:17:22+00:00","first_seen_at":"2026-11-05T03:31:41+00:00","fetched_at":"2026-11-05T03:31:41+00:00","note":null}],"documents":[{"id":72692,"url":"https://github.com/kyverno/kyverno/security/advisories/GHSA-qc9c-3fgf-cgq8","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-21T15:43:08+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":72693,"url":"https://www.vulncheck.com/advisories/kyverno-before-1.19.2-policy-bypass-via-admissionpolicygenerator-policyexception-handling","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"}],"exploit_sources":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}