{"schema":"threatline.record/2","record":{"id":"CVE-2026-26287","aliases":["GHSA-q7hv-xx6h-q2x8","GO-2026-6667"],"summary":"External Secrets Operator: label enforcement bypass in webhook generator enables secret exfiltration","details":"## Summary\nA bug in the `webhook` generator initialization order incorrectly cleared the label-enforcement flag (`EnforceLabels`) after it was set, resulting in the provider-side check for `external-secrets.io/type=webhook` being skipped (and the operation to succeed while it should have failed with `secret does not contain needed label 'external-secrets.io/type: webhook'. Update secret label to use it with webhook`.\n\n## Impact\nA user with the permission to create webhook generator can set the webhook generator to a victim' secret (which was not previously labelled for webhook's use), and exfiltrate it to a malicious URL.\n\n## Mitigations\nUntil you upgrade, you can reduce risk by:\n- disabling webhook generators if not needed (or denying `generators.external-secrets.io/v1alpha1` `Webhook` via an admission policy);\n- restricting RBAC: limit who can create generators of kind `Webhook`;\n- enforcing an admission policy (OPA Gatekeeper / Kyverno) requiring referenced secrets to be labeled `external-secrets.io/type=webhook`;\n- restricting egress from external-secrets controller pods to an allowlist (kubernetes `NetworkPolicy` / service mesh egress policy).\n\n## References\n- PR #5901 (fix: webhook initialization order)","categories":["Libraries & packages"],"product":"github.com/external-secrets/external-secrets","vendor":"external-secrets","ecosystem":"go","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-q7hv-xx6h-q2x8","source_modified_at":"2026-10-06T15:29:26Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"go","name":"github.com/external-secrets/external-secrets"},"range":">= 0.10.0, < 1.3.2"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-26287","source_modified_at":"2026-10-06T17:21:44.292Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"external-secrets","vendor":"external-secrets","versions":[{"version":">= 0.10.0, < 1.3.2","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-q7hv-xx6h-q2x8","source_modified_at":"2026-10-20T00:55:45.081616683Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"github.com/external-secrets/external-secrets","ecosystem":"Go","purl":"pkg:golang/github.com/external-secrets/external-secrets"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.10.0"},{"fixed":"1.3.2"}]}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-q7hv-xx6h-q2x8","source_modified_at":"2026-10-06T15:29:26Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"go","name":"github.com/external-secrets/external-secrets"},"version":"1.3.2"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-q7hv-xx6h-q2x8","source_modified_at":"2026-10-20T00:55:45.081616683Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"github.com/external-secrets/external-secrets","ecosystem":"Go","purl":"pkg:golang/github.com/external-secrets/external-secrets"},"version":"1.3.2"}],"cvss":7.1,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00244,"percentile":0.14774,"score_date":"2026-10-23"},"published_at":"2026-10-06T15:31:56.088Z","modified_at":"2026-10-20T00:55:45.081616683Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-q7hv-xx6h-q2x8","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-06T15:29:26Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-26287","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-06T17:21:44.292Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-q7hv-xx6h-q2x8","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-20T00:55:45.081616683Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-26287","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/external-secrets/external-secrets/security/advisories/GHSA-q7hv-xx6h-q2x8","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/external-secrets/external-secrets/pull/5901","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/external-secrets/external-secrets/commit/25aa09275861e3ed6fc5d2a1a60b9ac3df4a93ba","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/external-secrets/external-secrets/releases/tag/v1.3.2","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-q7hv-xx6h-q2x8","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-06T17:21:33.262411Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-20T00:55:45.081616683Z","content_hash":"c93f62c19f1a16d43e8db5a84e5259d8ea866133732b88c78a1fc295e7379076"}}