{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86121 exists.","fix":"No fix has been published for CVE-2026-86121 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-86121 is a critical authentication bypass vulnerability in trycua cua-computer-server, published on 5 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-2026-86121 and fix it if it is affected.\n\nWhat it is: CVE-2026-86121 is a critical authentication bypass vulnerability in trycua cua-computer-server, published on 5 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-2026-86121 exists.\n\nAffected product: trycua cua-computer-server. 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-2026-86121/ (Markdown: https://insights.sbomify.com/CVE-2026-86121/index.md)","id":"CVE-2026-86121","markdown":"https://insights.sbomify.com/CVE-2026-86121/index.md","name":"CVE-2026-86121","record":{"aliases":["GHSA-pccw-h89v-h9cj"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution","data_read","data_modify"],"network_reachable":"yes","non_default_config":true,"product_category":"Cua computer-server","requires_auth":"none","summary":"Unauthenticated attackers can execute arbitrary commands and access files on Cua computer-server when the CONTAINER_NAME environment variable is unset.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":9.3,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"}],"description":"Cua computer-server versions before 0.3.42 skip authentication when the CONTAINER_NAME environment variable is unset and bind to all interfaces by default, allowing unauthenticated attackers to execute arbitrary commands. Attackers can reach TCP port 8000 to run shell commands via the run_command endpoint, read and write arbitrary files through file operation endpoints, and access interactive PTY shells without authentication.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control","id":"CVE-2026-86121","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"Rowboat through 0.9.1 Server-Side Request Forgery via Custom MCP Server","id":"CVE-2026-86122"},"packages":[],"prev":{"headline":"APITable through 1.13.0-beta.1 Fail-Open Authorization in the Fusion API Node Permission Guard","id":"CVE-2026-86120"},"products":["cua-computer-server"],"published":"2026-09-05","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)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-24","vendors":["trycua"]},"summary":"Unauthenticated attackers can execute arbitrary commands and access files on Cua computer-server when the CONTAINER_NAME environment variable is unset.","url":"https://insights.sbomify.com/CVE-2026-86121/"}