{"answers":{"affected":"4 open source packages ship an affected version, including github.com/openbao/openbao and openbao. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-39388 in the wild and no public exploit code.","fix":"Upgrade github.com/openbao/openbao to 0.0.0-20260420160924-abe84e1af4c3 or later.","what":"CVE-2026-39388 is a low-severity authentication bypass vulnerability in openbao, published on 21 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-39388 and fix it if it is affected.\n\nWhat it is: CVE-2026-39388 is a low-severity authentication bypass vulnerability in openbao, published on 21 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-39388 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/openbao/openbao (Go): affected all versions; fixed in 0.0.0-20260420160924-abe84e1af4c3\n- github.com/openbao/openbao (Go): affected all versions; fixed in 0.0.0-20260420160924-abe84e1af4c3\n- github.com/openbao/openbao (Go): affected all versions; fixed in 0.0.0-20260420160924-abe84e1af4c3\n- openbao (Bitnami): affected all versions; fixed in 2.5.3\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-39388/ (Markdown: https://insights.sbomify.com/CVE-2026-39388/index.md)","id":"CVE-2026-39388","markdown":"https://insights.sbomify.com/CVE-2026-39388/index.md","name":"CVE-2026-39388","record":{"aliases":["BIT-openbao-2026-39388","GHSA-7ccv-rp6m-rffr","GO-2026-5213"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["privilege_escalation","security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"OpenBao secrets manager","requires_auth":"high_privilege","summary":"Attackers with sibling certificates can renew tokens for different roles, extending lease lifetimes and bypassing certificate binding restrictions.","user_interaction":"required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"openbao","vendor":"openbao"}],"cvss":{"score":2,"severity":"low","source":"cna","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","version":"4.0"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"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.","ecosystems":["Bitnami","Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"OpenBao's Certificate Authentication Allows Token Renewal With Different Certificate","id":"CVE-2026-39388","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":4,"n_references":1,"next":{"headline":"CI4MS has a Hidden Items Authorization Bypass in Fileeditor Allows Reading Secrets and Writing Protected Files","id":"CVE-2026-39389"},"packages":[{"ecosystem":"Bitnami","fixed":["2.5.3"],"introduced":["0"],"last_affected":[],"package":"openbao","purl":"pkg:bitnami/openbao","source":"BIT-openbao-2026-39388"},{"ecosystem":"Go","fixed":["0.0.0-20260420160924-abe84e1af4c3"],"introduced":["0"],"last_affected":[],"package":"github.com/openbao/openbao","purl":null,"source":"GHSA-7ccv-rp6m-rffr"},{"ecosystem":"Go","fixed":["0.0.0-20260420160924-abe84e1af4c3"],"introduced":["0"],"last_affected":[],"package":"github.com/openbao/openbao","purl":"pkg:golang/github.com/openbao/openbao","source":"GHSA-7ccv-rp6m-rffr"},{"ecosystem":"Go","fixed":["0.0.0-20260420160924-abe84e1af4c3"],"introduced":["0"],"last_affected":[],"package":"github.com/openbao/openbao","purl":"pkg:golang/github.com/openbao/openbao","source":"GO-2026-5213"}],"prev":{"headline":"BoidCMS: Local File Inclusion (LFI) leads to Remote Code Execution (RCE) via tpl parameter","id":"CVE-2026-39387"},"products":["openbao"],"published":"2026-04-21","related":[{"cvss_score":9.6,"headline":"OpenBao lacks user confirmation for OIDC direct callback mode","id":"CVE-2026-33757","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":9.4,"headline":"OpenBao has Reflected XSS in its OIDC authentication error message","id":"CVE-2026-33758","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":9.1,"headline":"OpenBao: Privileged Operator May Execute Code on the Underlying Host","id":"CVE-2025-54997","kev_date_added":null,"published":"2025-08-09"},{"cvss_score":7.5,"headline":"OpenBao Privileged Operator Identity Group Root Escalation","id":"CVE-2025-64761","kev_date_added":null,"published":"2025-11-25"},{"cvss_score":7.5,"headline":"OpenBao vulnerable to denial of service via malicious JSON request processing","id":"CVE-2025-59043","kev_date_added":null,"published":"2025-10-17"},{"cvss_score":7.2,"headline":"OpenBao Root Namespace Operator May Elevate Token Privileges","id":"CVE-2025-54996","kev_date_added":null,"published":"2025-08-09"},{"cvss_score":6.9,"headline":"OpenBao Vulnerable to Unauthenticated Rekey Operation Cancellation","id":"CVE-2025-52894","kev_date_added":null,"published":"2025-06-25"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-21","vendors":["openbao"]},"summary":"Attackers with sibling certificates can renew tokens for different roles, extending lease lifetimes and bypassing certificate binding restrictions.","url":"https://insights.sbomify.com/CVE-2026-39388/"}