{"cve":"CVE-2026-39388","nvd":{"published":"2026-04-21T01:16:06.357","modified":"2026-06-17T10:42:02.083","status":"Analyzed","description":"OpenBao is an open source identity-based secrets management system. Prior to version 2.5.3, OpenBao's Certificate authentication method, when a token renewal is requested and `disable_binding=true` is set, attempts to verify the current request's presented mTLS certificate matches the original. Token renewals for other authentication methods do not require any supplied login information. Due to incorrect matching, the certificate authentication method would allow renewal of tokens for which the attacker had a sibling certificate+key signed by the same CA, but which did not necessarily match the original role or the originally supplied certificate. This implies an attacker could still authenticate to OpenBao in a similar scope, however, token renewal implies that an attacker may be able to extend the lifetime of dynamic leases held by the original token. This attack requires knowledge of either the original token or its accessor. This vulnerability is original from HashiCorp Vault. This is addressed in v2.5.3. As a workaround, ensure privileged roles are tightly scoped to single certificates.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":2.0},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N","score":3.1},"cwes":["CWE-295"],"references":["https://github.com/openbao/openbao/security/advisories/GHSA-7ccv-rp6m-rffr"],"products":["openbao:openbao"],"source":"nvd","synced_at":"2026-10-19T22:30:49.762551342+00:00"},"epss":{"cve":"CVE-2026-39388","score":0.00101,"percentile":0.00894,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7ccv-rp6m-rffr","url":"https://osv.dev/vulnerability/GHSA-7ccv-rp6m-rffr","summary":"OpenBao's Certificate Authentication Allows Token Renewal With Different Certificate","modified":"2026-09-10T03:50:43.643918213Z","packages":[{"ecosystem":"Go","name":"github.com/openbao/openbao","purl":"pkg:golang/github.com/openbao/openbao","ranges":["<0.0.0-20260420160924-abe84e1af4c3"],"fixed":["0.0.0-20260420160924-abe84e1af4c3"]}]},{"id":"GO-2026-5213","url":"https://osv.dev/vulnerability/GO-2026-5213","summary":"OpenBao's Certificate Authentication Allows Token Renewal With Different Certificate in github.com/openbao/openbao","modified":"2026-07-27T09:11:34.327581596Z","packages":[{"ecosystem":"Go","name":"github.com/openbao/openbao","purl":"pkg:golang/github.com/openbao/openbao","ranges":["<0.0.0-20260420160924-abe84e1af4c3"],"fixed":["0.0.0-20260420160924-abe84e1af4c3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}