{"id":"CVE-2026-58480","aliases":["EUVD-2026-42233","GHSA-r58f-77hp-phcj"],"status":"published","title":"Blocksy Companion Pro \u003c 2.1.47 Unauthenticated File Upload via save_attachments","description":"Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can exploit the Custom Fonts extension's flawed strpos() substring check by uploading double-extension filenames such as shell.woff2.php, causing the validation to pass on the substring match while the web server executes the file as PHP, achieving remote code execution.","severity":{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.03572,"percentile":0.89463,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-434"],"published":"2026-07-08T13:05:02Z","modified":"2026-10-25T20:10:00Z","exploits":[{"source":"exploitdb","id":"EDB-52640","title":"Blocksy Companion  2.1.46 - RCE","type":"webapps","platform":"multiple","date":"2026-08-11","url":"https://www.exploit-db.com/exploits/52640"},{"source":"pocgithub","id":"shinthink/CVE-2026-58480","title":"shinthink/CVE-2026-58480","date":"2026-07-26","url":"https://github.com/shinthink/CVE-2026-58480"}],"products":[{"vendor":"creative themes","product":"blocksy companion"},{"vendor":"creativethemeshq","product":"blocksy companion"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/blocksy-companion/blocksy-companion-2146-unauthenticated-arbitrary-file-upload-via-blc-review-images-parameter","tags":["third-party-advisory"]},{"url":"https://patchstack.com/database/wordpress/plugin/blocksy-companion/vulnerability/wordpress-blocksy-companion-plugin-2-1-46-unauthenticated-arbitrary-file-upload-vulnerability","tags":["third-party-advisory"]},{"url":"https://wordpress.org/plugins/blocksy-companion/","tags":["product","patch"]},{"url":"https://www.vulncheck.com/advisories/blocksy-companion-pro-unauthenticated-file-upload-via-save-attachments","tags":["third-party-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58480"},{"url":"https://wordpress.org/plugins/blocksy-companion"},{"url":"https://github.com/advisories/GHSA-r58f-77hp-phcj"}],"sources":{"cve":[{"id":"CVE-2026-58480","title":"Blocksy Companion Pro \u003c 2.1.47 Unauthenticated File Upload via save_attachments","description":"Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can exploit the Custom Fonts extension's flawed strpos() substring check by uploading double-extension filenames such as shell.woff2.php, causing the validation to pass on the substring match while the web server executes the file as PHP, achieving remote code execution.","status":"published","published":"2026-07-08T13:05:02.727Z","modified":"2026-07-14T22:03:17.7Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"},{"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":"cna"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T13:47:28.691429Z"}],"euvd":[{"id":"EUVD-2026-42233","description":"Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can exploit the Custom Fonts extension's flawed strpos() substring check by uploading double-extension filenames such as shell.woff2.php, causing the validation to pass on the substring match while the web server executes the file as PHP, achieving remote code execution.","status":"published","published":"2026-07-08T13:05:02Z","modified":"2026-07-14T22:03:17Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-02T18:19:57.911867Z"}],"ghsa":[{"id":"GHSA-r58f-77hp-phcj","title":"Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary...","description":"Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can exploit the Custom Fonts extension's flawed strpos() substring check by uploading double-extension filenames such as shell.woff2.php, causing the validation to pass on the substring match while the web server executes the file as PHP, achieving remote code execution.","status":"published","published":"2026-07-08T15:32:01Z","modified":"2026-07-08T15:32:07Z","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"},{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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","level":"critical"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T15:09:20.268554Z"}],"nvd":[{"id":"CVE-2026-58480","description":"Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can exploit the Custom Fonts extension's flawed strpos() substring check by uploading double-extension filenames such as shell.woff2.php, causing the validation to pass on the substring match while the web server executes the file as PHP, achieving remote code execution.","status":"published","published":"2026-07-08T14:17:19.977Z","modified":"2026-10-25T20:10:00.147Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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","level":"critical","assessor":"secondary"},{"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":"primary"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T14:12:28.040501Z"}]}}