{"id":"CVE-2026-55774","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55774","generatedAt":"2026-10-28T02:57:46.977Z","title":"Prior to 2.5.5, an OpenBao user with access to sys/leases/revoke/:lease_id in one namespace could revoke a lease in another namespace when the foreign lease_id was known, bypassing namespace ACL isolation.","description":"OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an OpenBao user with access to sys/leases/revoke/:lease_id in one namespace could revoke a lease in another namespace when the foreign lease_id was known, bypassing namespace ACL isolation. The affected lease lookup routing in vault/expiration.go allowed FetchLeaseInfo and loadEntry to resolve cached or stored lease data outside the request namespace, allowing a tenant that intentionally disclosed a lease identifier to have the lease and its underlying credential revoked by another tenant. This issue is fixed in version 2.5.5.","published":"2026-09-15T16:17:16.000Z","lastModified":"2026-09-25T14:24:00.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":2.1,"severity":"LOW","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/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/M"},"cwe":["CWE-863"],"affected":[],"epss":{"score":0.00562,"percentile":0.46468,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.56%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/openbao/openbao/commit/9ba1413d793223cca67db12434093a2f25fdc540","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/commit/b20b999dd4044d7b419a5472d8fe08407828be37","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/pull/3307","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/pull/3310","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/releases/tag/v2.5.5","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/releases/tag/v2.6.0","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/security/advisories/GHSA-c36x-h252-g9x2","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55774","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}