{"schemaVersion":3,"id":"CVE-2026-53946","aliases":["GHSA-g366-23fw-ggp6","BIT-ghost-2026-53946"],"status":"published","duplicateOf":null,"title":null,"description":"Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, when re-rendering posts, Ghost would refetch missing image dimensions by issuing an outbound HTTP request to the URL stored on an image card — without restricting that URL to trusted image hosts. An authenticated staff user able to create or edit posts could therefore point an image card at an attacker-chosen host and cause the Ghost server to request it on their behalf, including hosts on internal networks or cloud instance metadata endpoints that would not normally be reachable from the public internet. This vulnerability is fixed in 6.21.1.","dates":{"published":"2026-06-24T18:08:44.602Z","modified":"2026-06-25T19:57:03.997Z","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:R/S:C/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:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Npm","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","exploitability":5.9,"impact":4.5,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00207,"percentile":0.1027,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00207},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00207,"percentile":0.1027}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00207,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00207,"percentile":0.1027}]},"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-918","name":"Server-Side Request Forgery (SSRF)","description":"The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/918.html"}],"affected":[{"vendor":"Npm","product":"ghost","name":"ghost","label":"ghost","ecosystem":"Npm","cpePart":null,"purl":"pkg:npm/ghost","purlType":"npm","versions":[{"text":"≥ 6.19.4, < 6.21.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.19.4, < 6.21.2","eol":null,"hubHref":null},{"vendor":"tryghost","product":"ghost","name":"Ghost","label":"ghost","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.19.4, < 6.21.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.19.4, < 6.21.1","eol":null,"hubHref":"/vendor/tryghost/ghost"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-g366-23fw-ggp6","label":"github.com/TryGhost/Ghost/security/advisories/GHSA-g366-23fw-ggp6","hostname":"github.com","tags":["X Refsource CONFIRM","WEB"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53946","label":"nvd.nist.gov/vuln/detail/CVE-2026-53946","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/TryGhost/Ghost/pull/26753","label":"github.com/TryGhost/Ghost/pull/26753","hostname":"github.com","tags":["WEB"]},{"url":"https://github.com/TryGhost/Ghost/commit/ba692df7f27162d0440d57487f16c530416a8eb2","label":"github.com/TryGhost/Ghost/commit/ba692df7f27162d0440d57487f16c530416a8eb2","hostname":"github.com","tags":["WEB"]},{"url":"https://github.com/TryGhost/Ghost","label":"github.com/TryGhost/Ghost","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://github.com/TryGhost/Ghost/releases/tag/v6.21.1","label":"github.com/TryGhost/Ghost/releases/tag/v6.21.1","hostname":"github.com","tags":["WEB"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-06-24T18:08:44.602Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-25T19:57:03.997Z","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":"2026-10-22T06:15:11.363Z","stale":false,"partial":false}}