{"schemaVersion":3,"id":"CVE-2026-66797","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Improper access control in CloudStack's annotation functionality allows unauthorized comment creation and disclosure.\n\n\n\n\nThe addAnnotation and listAnnotation APIs perform an ownership check when an entity's UUID is specified, but fail to honor its result correctly. This lets any authenticated user write annotations to, and disclose existing annotations/comments on, an entity they don't own by simply supplying its UUID.\n\n\n\n\nThis issue affects Apache CloudStack: from 4.15.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0.\n\n\n\n\n\nUsers are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.","dates":{"published":"2026-08-21T08:21:58.452Z","modified":"2026-08-21T19:45:45.850Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.4,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00461,"percentile":0.38607,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.19800000000000004,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00263},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00461,"percentile":0.38607}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00263,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00461,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00461,"percentile":0.38607}]},"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":[],"exploitCount":0,"weaknesses":[{"id":"CWE-284","name":"Improper Access Control","description":"The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.","type":"weakness","status":"Incomplete","abstraction":"Pillar","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/284.html"}],"affected":[{"vendor":"apache software foundation","product":"apache cloudstack","name":"Apache CloudStack","label":"apache cloudstack","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.16.0.0, ≤ 4.20.3.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.21.0.0, ≤ 4.22.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.16.0.0, ≤ 4.20.3.0 | ≥ 4.21.0.0, ≤ 4.22.1.0","eol":null,"hubHref":"/vendor/apache_software_foundation/apache_cloudstack"},{"vendor":"apache","product":"cloudstack","name":"cloudstack","label":"cloudstack","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.15.0.0, < 4.20.3.1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.21.0.0, < 4.22.1.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.15.0.0, < 4.20.3.1 | ≥ 4.21.0.0, < 4.22.1.1","eol":null,"hubHref":"/vendor/apache/cloudstack"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc","label":"lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc","hostname":"lists.apache.org","tags":["Vendor Advisory","Mailing List"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-08-21T08:21:58.452Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-21T19:45:45.850Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":22,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T19:33:49.733Z","stale":false,"partial":false}}