{"id":"CVE-2026-16618","aliases":["EUVD-2026-52578","GHSA-62v2-7mcm-qpm4"],"status":"published","title":"ImproveSEO \u003c= 2.0.11 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution","description":"The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files, checking only the file content type while writing the file with the attacker-supplied extension into a publicly accessible directory, allowing unauthenticated users to upload executable PHP files and achieve remote code execution.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00831,"percentile":0.57878,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-434"],"published":"2026-08-04T06:00:08Z","modified":"2026-08-26T16:31:16Z","products":[{"vendor":"unknown","product":"improve seo"}],"references":[{"url":"https://wpscan.com/vulnerability/3754d4c0-1b67-49a4-a29a-7169446638d1/","tags":["exploit","vdb-entry","technical-description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16618"},{"url":"https://wpscan.com/vulnerability/3754d4c0-1b67-49a4-a29a-7169446638d1"},{"url":"https://github.com/advisories/GHSA-62v2-7mcm-qpm4"}],"sources":{"cve":[{"id":"CVE-2026-16618","title":"ImproveSEO \u003c= 2.0.11 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution","description":"The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files, checking only the file content type while writing the file with the attacker-supplied extension into a publicly accessible directory, allowing unauthenticated users to upload executable PHP files and achieve remote code execution.","status":"published","published":"2026-08-04T06:00:08.334Z","modified":"2026-08-04T17:40:09.473Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T14:20:11.24076Z"}],"euvd":[{"id":"EUVD-2026-52578","description":"The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files, checking only the file content type while writing the file with the attacker-supplied extension into a publicly accessible directory, allowing unauthenticated users to upload executable PHP files and achieve remote code execution.","status":"published","published":"2026-08-04T06:00:08Z","modified":"2026-08-04T17:40:09Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T18:02:22.965583Z"}],"ghsa":[{"id":"GHSA-62v2-7mcm-qpm4","title":"The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files,...","description":"The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files, checking only the file content type while writing the file with the attacker-supplied extension into a publicly accessible directory, allowing unauthenticated users to upload executable PHP files and achieve remote code execution.","status":"published","published":"2026-08-04T09:31:35Z","modified":"2026-08-04T18:32:28Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T15:10:06.083807Z"}],"nvd":[{"id":"CVE-2026-16618","description":"The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files, checking only the file content type while writing the file with the attacker-supplied extension into a publicly accessible directory, allowing unauthenticated users to upload executable PHP files and achieve remote code execution.","status":"published","published":"2026-08-04T07:16:30.707Z","modified":"2026-08-26T16:31:16.753Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T14:12:34.643497Z"}]}}