{"schemaVersion":3,"id":"CVE-2023-6621","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"The POST SMTP WordPress plugin before 2.8.7 does not sanitise and escape the msg parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.","dates":{"published":"2024-01-03T08:32:42.957Z","modified":"2025-06-18T15:36:31.330Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.1,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/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":6.1,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.1,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00401,"percentile":0.33163,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00401},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00401,"percentile":0.33163}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00401,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00401,"percentile":0.33163}]},"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":"REF_9374D02E565EFC48","name":"Exploit Reference (wpscan.com)","source":"reference","url":"https://wpscan.com/vulnerability/b49ca336-5bc2-4d72-a9a5-b8c020057928","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","description":"The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/79.html"}],"affected":[{"vendor":"unknown","product":"post smtp","name":"POST SMTP","label":"post smtp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 2.8.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.8.7","eol":null,"hubHref":"/vendor/unknown/post_smtp"},{"vendor":"wpexperts","product":"post_smtp","name":"post smtp","label":"post_smtp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 2.8.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.8.7","eol":null,"hubHref":"/vendor/wpexperts/post_smtp"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://wpscan.com/vulnerability/b49ca336-5bc2-4d72-a9a5-b8c020057928","label":"wpscan.com/vulnerability/b49ca336-5bc2-4d72-a9a5-b8c020057928","hostname":"wpscan.com","tags":["Exploit","VDB Entry","Technical Description","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2024-01-03T08:32:42.957Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-06-18T15:36:31.330Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":34,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T05:35:44.834Z","stale":false,"partial":false}}