{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86009 exists.","fix":"No fix has been published for CVE-2026-86009 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-86009 is a high-severity missing authorization vulnerability in Mailu, published on 16 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-86009 and fix it if it is affected.\n\nWhat it is: CVE-2026-86009 is a high-severity missing authorization vulnerability in Mailu, published on 16 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86009 exists.\n\nAffected product: Mailu. 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-2026-86009/ (Markdown: https://insights.sbomify.com/CVE-2026-86009/index.md)","id":"CVE-2026-86009","markdown":"https://insights.sbomify.com/CVE-2026-86009/index.md","name":"CVE-2026-86009","record":{"aliases":["GHSA-crww-m82r-2wfm"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Mail server","requires_auth":"high_privilege","summary":"Domain managers can improperly enable spoofing for domains they do not control, allowing authenticated email forgery.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"},{"id":"CWE-285","name":"Improper Authorization"}],"description":"Mailu is a mail server distributed as a set of Docker images. Prior to f05aeb8322e2f61096af6b089d61ba6f40587d96, domain managers can enable spoofing for hosted domains they do not control. A potentially malicious domain administrator enables spoofing for another hosted domain and can send emails that are authenticated with DKIM/SPF for domains they should not be able to. This vulnerability is addressed by f05aeb8322e2f61096af6b089d61ba6f40587d96.","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":"Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control","id":"CVE-2026-86009","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"VNote: Stored XSS via YAML Frontmatter Leading to Local File Read and Remote Exfiltration","id":"CVE-2026-86016"},"packages":[],"prev":{"headline":"Mailu domain managers can take over higher-privileged accounts","id":"CVE-2026-86008"},"products":["Mailu"],"published":"2026-10-16","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":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-21","vendors":["Mailu"]},"summary":"Domain managers can improperly enable spoofing for domains they do not control, allowing authenticated email forgery.","url":"https://insights.sbomify.com/CVE-2026-86009/"}