{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-39388", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-06T22:06:40.515Z", "datePublished": "2026-04-21T00:43:22.920Z", "dateUpdated": "2026-04-21T19:36:07.865Z"}, "containers": {"cna": {"title": "OpenBao's Certificate Authentication Allows Token Renewal With Different Certificate", "problemTypes": [{"descriptions": [{"cweId": "CWE-295", "lang": "en", "description": "CWE-295: Improper Certificate Validation", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "HIGH", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 2, "baseSeverity": "LOW", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/openbao/openbao/security/advisories/GHSA-7ccv-rp6m-rffr", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/openbao/openbao/security/advisories/GHSA-7ccv-rp6m-rffr"}], "affected": [{"vendor": "openbao", "product": "openbao", "versions": [{"version": "< 2.5.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-21T00:43:22.920Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-7ccv-rp6m-rffr", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-21T19:35:56.012388Z", "id": "CVE-2026-39388", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-21T19:36:07.865Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.5.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "openbao", "source": "cna", "vendor": "openbao"}, "product": "openbao", "vendor": "openbao"}], "analysis": {"en": {"generated_at": "2026-04-21T15:33:03.568794+00:00", "value": {"mitigation_remediation": ["Update OpenBao to version 2.5.3 or newer to address the certificate verification flaw.", "Configure privileged roles to bind to a single certificate, eliminating the possibility that a sibling certificate can be used for renewal.", "Review the use of the `disable_binding` setting; disable it or enforce correct certificate matching logic before allowing token renewal."], "summary": {"action": "Patch", "impact": "Extended token lifetime through certificate misuse"}, "threat_synthesis": {"affected_systems": "Versions of OpenBao prior to v2.5.3 are affected. The vulnerability is present across all installations using the certificate authentication method with the `disable_binding` option enabled. The fix is delivered in OpenBao v2.5.3 and later.", "description_and_impact": "OpenBao\u2019s certificate authentication method allows an attacker who possesses a sibling certificate issued by the same CA to renew a token that was originally authenticated with a different certificate, provided the `disable_binding=true` flag is set. The flaw occurs because the system incorrectly verifies the presented certificate against the original during renewal, permitting the attacker to extend the life of dynamic leases or other privileges that were granted to the original token. This weakness is a certificate policy error (CWE\u2011295) and can be leveraged only when the attacker already knows the original token or its accessor, but it still allows undue persistence in the system.", "risk_and_exploitability": "The vulnerability has a CVSS score of 2, indicating low severity, and its EPSS score is not available. It is not listed in the CISA KEV catalog. Exploitation requires possession of a valid sibling certificate and either the original token or its accessor, making it a high\u2011skill attack rather than a widespread vulnerability. The availability of a public patch mitigates the risk significantly, but organizations still need to verify that the new version is deployed and that privileged certificates are appropriately scoped."}}}}, "created": "2026-04-21T03:00:06.228692+00:00", "updated": "2026-04-21T15:37:55.178915+00:00", "vendors": ["openbao", "openbao$PRODUCT$openbao"]}