{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90898 exists.","fix":"No fix has been published for CVE-2026-90898 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-90898 is a critical authentication bypass vulnerability in maximhq Bifrost, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-90898 and fix it if it is affected.\n\nWhat it is: CVE-2026-90898 is a critical authentication bypass vulnerability in maximhq Bifrost, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90898 exists.\n\nAffected product: maximhq Bifrost. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-90898/ (Markdown: https://insights.sbomify.com/CVE-2026-90898/index.md)","id":"CVE-2026-90898","markdown":"https://insights.sbomify.com/CVE-2026-90898/index.md","name":"CVE-2026-90898","record":{"aliases":["GHSA-gqjq-cgxr-8c7c"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Bifrost MCP gateway","requires_auth":"none","summary":"Unauthenticated attackers can register malicious MCP clients to execute arbitrary code on the Bifrost server due to disabled authentication by default.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"JFROG","cpe":[],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"},{"id":"CWE-284","name":"Improper Access Control"}],"description":"Bifrost registers MCP clients through its management API. A stdio client is a command plus args. Bifrost starts that program in the gateway the moment the client is added. No MCP handshake required.\n\nThe default is governance.auth_config.is_enabled=false. Auth off means every caller is a local admin. One unauthenticated POST /api/mcp/client is enough to run a program as the Bifrost process user (appuser on the official image).\n\n transports/v2.1.0 refuses an unauthenticated stdio registration with 403. transports/v2.0.0 still allows it.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-09-23","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":1,"refs":[{"date":"2026-09-23T01:41:15Z","kind":"github_poc","ref":"https://github.com/HORKimhab/CVE-2026-90898","stars":0,"title":"CVE-2026-90898 - Draft or TODO"},{"date":null,"kind":"nuclei","ref":"http/cves/2026/CVE-2026-90898.yaml","stars":null,"title":"Bifrost \u003c 2.1.0 - Unauthenticated MCP Stdio Command Execution"}],"tier":"weaponised"},"has_fix":false,"headline":"Bifrost unauthenticated remote code execution via MCP stdio client registration","id":"CVE-2026-90898","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"Information disclosure in Easy Store extension for Joomla","id":"CVE-2026-90899"},"packages":[],"prev":{"headline":"Missing authentication in Ecommerce Template checkout session endpoint allows unauthenticated disclosure of buyer PII","id":"CVE-2026-90896"},"products":["Bifrost"],"published":"2026-09-14","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"MIT","name":"Nuclei templates"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-14","vendors":["maximhq"]},"summary":"Unauthenticated attackers can register malicious MCP clients to execute arbitrary code on the Bifrost server due to disabled authentication by default.","url":"https://insights.sbomify.com/CVE-2026-90898/"}