{"schemaVersion":3,"id":"CVE-2026-55761","aliases":["GHSA-x626-fcwx-f5pc","GO-2026-6324"],"status":"published","duplicateOf":null,"title":null,"description":"Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. In versions 2.39.0 through 2.39.3 and 2.40.0 until 2.43.0, unauthenticated restore and administrator initialization endpoints (/api/restore and /api/users/admin/init) remain accessible during the five-minute setup window for uninitialized instances, allowing a network attacker to restore a crafted backup or create the first administrator account and gain full administrative access. This issue is fixed in versions 2.39.4 and 2.43.0.","dates":{"published":"2026-07-08T15:03:54.158Z","modified":"2026-07-08T15:52:30.257Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.1,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Go","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Go","score":5.9,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","exploitability":5.6,"impact":6,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.9,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00493,"percentile":0.41359,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00493},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00493,"percentile":0.41359}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00493,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00493,"percentile":0.41359}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"GITHUB_PORTAINER_PORTAINER","name":"Portainer","source":"github","url":"https://github.com/portainer/portainer/issues/2475","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-287","name":"Improper Authentication","description":"When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/287.html"}],"affected":[{"vendor":"github.com/portainer","product":"portainer","name":"github.com/portainer/portainer","label":"portainer","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/portainer/portainer","purlType":"golang","versions":[{"text":"≥ 2.39.0, < 2.39.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.40.0, < 2.43.0","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"≥ 2.39.0, < 2.39.4 | ≥ 2.40.0, < 2.43.0 | All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"portainer","product":"portainer","name":"portainer","label":"portainer","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.39.0, < 2.39.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.40.0, < 2.43.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.39.0, < 2.39.4 | ≥ 2.40.0, < 2.43.0","eol":null,"hubHref":"/vendor/portainer/portainer"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/portainer/portainer/security/advisories/GHSA-x626-fcwx-f5pc","label":"github.com/portainer/portainer/security/advisories/GHSA-x626-fcwx-f5pc","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Advisory","Exploit","Mitigation","Vendor Advisory"]},{"url":"https://github.com/portainer/portainer/issues/2770","label":"github.com/portainer/portainer/issues/2770","hostname":"github.com","tags":["X Refsource MISC","WEB","REPORT","Issue Tracking"]},{"url":"https://github.com/portainer/portainer/commit/49f19107cf9a3540cbe406c9eb7f24390e1af02b","label":"github.com/portainer/portainer/commit/49f19107cf9a3540cbe406c9eb7f24390e1af02b","hostname":"github.com","tags":["X Refsource MISC","WEB","FIX","Patch"]},{"url":"https://github.com/portainer/portainer/commit/d2b56efcb4e43c4168bb6688eee9f6bf22867312","label":"github.com/portainer/portainer/commit/d2b56efcb4e43c4168bb6688eee9f6bf22867312","hostname":"github.com","tags":["X Refsource MISC","WEB","FIX","Patch"]},{"url":"https://github.com/portainer/portainer/releases/tag/2.39.4","label":"github.com/portainer/portainer/releases/tag/2.39.4","hostname":"github.com","tags":["X Refsource MISC","WEB","Release Notes"]},{"url":"https://github.com/portainer/portainer/releases/tag/2.43.0","label":"github.com/portainer/portainer/releases/tag/2.43.0","hostname":"github.com","tags":["X Refsource MISC","WEB","Release Notes"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55761","label":"nvd.nist.gov/vuln/detail/CVE-2026-55761","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/portainer/portainer","label":"github.com/portainer/portainer","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:21812-1","SUSE-SU-2026:23692-1","SUSE-SU-2026:23712-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:21812-1","SUSE-SU-2026:23692-1","SUSE-SU-2026:23712-1"]},"timeline":[{"kind":"published","date":"2026-07-08T15:03:54.158Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-08T15:52:30.257Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":38,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T13:50:29.227Z","stale":false,"partial":false}}