{"answers":{"affected":"5 open source packages ship an affected version, including github.com/m1k1o/neko/server. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-39386 in the wild and no public exploit code.","fix":"Upgrade github.com/m1k1o/neko/server to a fixed version for your release line: 0.0.0-20260406184107-c54bcf1ee211 or 3.0.11.","what":"CVE-2026-39386 is a high-severity vulnerability in m1k1o neko, published on 21 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-39386 and fix it if it is affected.\n\nWhat it is: CVE-2026-39386 is a high-severity vulnerability in m1k1o neko, published on 21 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-39386 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/m1k1o/neko/server (Go): affected from 0.0.0-20250322225643-212bf8a60756; fixed in 0.0.0-20260406184107-c54bcf1ee211\n- github.com/m1k1o/neko/server (Go): affected from 0.0.0-20250322225643-212bf8a60756; fixed in 0.0.0-20260406184107-c54bcf1ee211\n- github.com/m1k1o/neko/server (Go): affected from 0.0.0-20250326225119-51bbad7650d3; fixed in 0.0.0-20260406184107-c54bcf1ee211\n- github.com/m1k1o/neko/server (Go): affected from 3.0.0; fixed in 3.0.11\n- github.com/m1k1o/neko/server (Go): affected from 3.0.0; fixed in 3.0.11\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-2026-39386/ (Markdown: https://insights.sbomify.com/CVE-2026-39386/index.md)","id":"CVE-2026-39386","markdown":"https://insights.sbomify.com/CVE-2026-39386/index.md","name":"CVE-2026-39386","record":{"aliases":["GHSA-2gw9-c2r2-f5qf","GO-2026-4960"],"analysis":{"component_type":"container_or_infrastructure","fix_type":"upgrade","impacts":["privilege_escalation","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Self-hosted virtual browser","requires_auth":"low_privilege","summary":"Authenticated users can escalate to full administrative control of the Neko virtual browser instance, compromising the entire system.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"neko","vendor":"m1k1o"}],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-862","name":"Missing Authorization"},{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"},{"id":"CWE-269","name":"Improper Privilege Management"},{"id":"CWE-284","name":"Improper Access Control"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"Neko is a a self-hosted virtual browser that runs in Docker and uses WebRTC In versions 3.0.0 through 3.0.10 and 3.1.0 through 3.1.1, any authenticated user can immediately obtain full administrative control of the entire Neko instance (member management, room settings, broadcast control, session termination, etc.). This results in a complete compromise of the instance. The vulnerability has been patched in v3.0.11 and v3.1.2. If upgrading is not immediately possible, the following mitigations can reduce risk: Restrict access to trusted users only (avoid granting accounts to untrusted parties); ensure all user passwords are strong and only shared with trusted individuals; run the instance only when needed; avoid leaving it continuously exposed; place the instance behind authentication layers such as a reverse proxy with additional access controls; disable or restrict access to the /api/profile endpoint if feasible; and/or monitor for suspicious privilege changes or unexpected administrative actions. Note that these are temporary mitigations and do not fully eliminate the vulnerability. Upgrading is strongly recommended.","ecosystems":["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":"Neko has Self-service Privilege Escalation for Authenticated Users","id":"CVE-2026-39386","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"privilege_escalation","year":"2026"},"n_packages":5,"n_references":3,"next":{"headline":"BoidCMS: Local File Inclusion (LFI) leads to Remote Code Execution (RCE) via tpl parameter","id":"CVE-2026-39387"},"packages":[{"ecosystem":"Go","fixed":["0.0.0-20260406184107-c54bcf1ee211"],"introduced":["0.0.0-20250322225643-212bf8a60756"],"last_affected":[],"package":"github.com/m1k1o/neko/server","purl":null,"source":"GHSA-2gw9-c2r2-f5qf"},{"ecosystem":"Go","fixed":["0.0.0-20260406184107-c54bcf1ee211"],"introduced":["0.0.0-20250322225643-212bf8a60756"],"last_affected":[],"package":"github.com/m1k1o/neko/server","purl":"pkg:golang/github.com/m1k1o/neko/server","source":"GHSA-2gw9-c2r2-f5qf"},{"ecosystem":"Go","fixed":["0.0.0-20260406184107-c54bcf1ee211"],"introduced":["0.0.0-20250326225119-51bbad7650d3"],"last_affected":[],"package":"github.com/m1k1o/neko/server","purl":"pkg:golang/github.com/m1k1o/neko/server","source":"GO-2026-4960"},{"ecosystem":"Go","fixed":["3.0.11"],"introduced":["3.0.0"],"last_affected":[],"package":"github.com/m1k1o/neko/server","purl":null,"source":"GHSA-2gw9-c2r2-f5qf"},{"ecosystem":"Go","fixed":["3.0.11"],"introduced":["3.0.0"],"last_affected":[],"package":"github.com/m1k1o/neko/server","purl":"pkg:golang/github.com/m1k1o/neko/server","source":"GHSA-2gw9-c2r2-f5qf"}],"prev":{"headline":"Frappe LMS enrollment bypass in paid courses via unrelated batch","id":"CVE-2026-39385"},"products":["neko"],"published":"2026-04-21","related":[],"sources":[{"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":"total"},"state":"PUBLISHED","updated":"2026-04-22","vendors":["m1k1o"]},"summary":"Authenticated users can escalate to full administrative control of the Neko virtual browser instance, compromising the entire system.","url":"https://insights.sbomify.com/CVE-2026-39386/"}