{"id":"CVE-2026-86008","kind":"vulnerability","aliases":["CVE-2026-86008"],"related":[],"title":"Mailu: domain managers can take over higher-privileged admin accounts","description":"Mailu is a mail server distributed as a set of Docker images. Prior to 8577c929b4ade04d3cd4210cf036601abd793556, a domain manager targeting an administrative account or another domain manager with greater privileges can reset passwords or obtain tokens for that account. This authorization failure allows a domain manager to take over a higher-privileged account and exercise that account's permissions. This vulnerability is addressed by commit 8577c929b4ade04d3cd4210cf036601abd793556.","summary":"Mailu is a self-hosted mail server shipped as Docker images. A domain manager can reset passwords or obtain tokens for an administrative account or a domain manager with more privileges, taking over that account.","severity":"high","cvss":7.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["docker","email","infrastructure","mailu","self-hosted"],"not_affected_if":["managed-hosting","no-domain-managers"],"how_to_check":"- Check the Mailu image or release tag in use and compare it against the fixed commit `8577c929b4ade04d3cd4210cf036601abd793556`\n- Review which accounts hold the domain manager role in the Mailu admin interface","fix":"- Update Mailu to a build that includes commit `8577c929b4ade04d3cd4210cf036601abd793556`\n- Review admin and domain manager accounts for unexpected password resets or tokens after upgrading","status":"open","published_at":"2026-10-16T17:17:51+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","triaged_at":"2026-10-25T03:29:32+00:00","updated_at":"2026-10-25T03:29:32+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-25T03:29:32Z","model":"claude-haiku-5-5","output":{"fix":"- Update Mailu to a build that includes commit `8577c929b4ade04d3cd4210cf036601abd793556`\n- Review admin and domain manager accounts for unexpected password resets or tokens after upgrading","reach":"network","title":"Mailu: domain managers can take over higher-privileged admin accounts","impact":"high","summary":"Mailu is a self-hosted mail server shipped as Docker images. A domain manager can reset passwords or obtain tokens for an administrative account or a domain manager with more privileges, taking over that account.","category":"infrastructure","nicknames":[],"who_cares":["mailu","self-hosted","docker","email"],"confidence":0.6,"needs_auth":"yes","worst_case":"A domain manager takes over a higher-privileged admin account","analyst_note":"Confirm the exact affected version range and whether the fix is in a tagged Mailu release; check the NVD entry and the linked commit.","how_to_check":"- Check the Mailu image or release tag in use and compare it against the fixed commit `8577c929b4ade04d3cd4210cf036601abd793556`\n- Review which accounts hold the domain manager role in the Mailu admin interface","needs_analyst":true,"not_affected_if":["managed-hosting","no-domain-managers"],"who_is_affected":"Teams running self-hosted Mailu that grant domain manager roles to users. Installations with only global admins and no delegated domain managers are less exposed. Unknown whether managed mail hosting is affected.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000613,"input_tokens":3364,"output_tokens":554,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-86008':14A,17A '8577c929b4ade04d3cd4210cf036601abd793556':75C,126C 'account':11A,49B,60B,82C,98C,113C,117C 'address':123C 'admin':10A 'administr':48B,81C 'allow':102C 'anoth':84C 'author':100C 'commit':125C 'cve':12A,15A 'distribut':66C 'docker':18B,35B,71C 'domain':2A,38B,52B,77C,85C,104C 'email':19B 'exercis':115C 'failur':101C 'greater':88C 'higher':8A,111C 'higher-privileg':7A,110C 'host':24B,30B 'imag':36B,72C 'infrastructur':20B 'mail':31B,64C 'mailu':1A,21B,25B,61C 'manag':3A,39B,53B,78C,86C,105C 'obtain':44B,94C 'password':42B,92C 'permiss':119C 'prior':73C 'privileg':9A,56B,89C,112C 'reset':41B,91C 'self':23B,29B 'self-host':22B,28B 'server':32B,65C 'set':69C 'ship':33B 'take':5A,57B,107C 'target':79C 'token':45B,95C 'vulner':121C","nicknames":[],"mitigations":[],"who_affected":"Teams running self-hosted Mailu that grant domain manager roles to users. Installations with only global admins and no delegated domain managers are less exposed. Unknown whether managed mail hosting is affected.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T17:17:51+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-86008","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86008","severity":null,"published_at":"2026-10-16T17:17:51+00:00","modified_at":"2026-10-16T17:17:51+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}