{"id":"CVE-2026-115935","aliases":["CLSA-2026-1793192483","EUVD-2026-109191","GHSA-9hp6-3565-gvh5","GHSA-j6hf-w48h-c9f9"],"status":"published","title":"Control panel only API response emulation replaces \"securityKey\" and reaches server RCE","description":"The app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user.\n\n\n\nA non-admin user with only accessCp can place newline characters in X-Craft-Plugin-Licenses. Craft passes this value to its .env writer without removing the newlines.\n\n\n\nThis lets the user insert a new attacker-known CRAFT_SECURITY_KEY into .env. After Craft loads that key, the user can forge a signed login redirect containing a Twig system() callback.\n\n\n\nThis is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00369,"percentile":0.31221,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-94"],"published":"2026-10-23T21:40:57Z","modified":"2026-11-04T02:30:29Z","affected":[{"source":"osv","ecosystem":"TuxCare:Packagist","package":"craftcms/cms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.18.7"},{"fixed":"4.18.7-p3+tuxcare"}]}],"versions":["4.18.7","4.18.7-p1+tuxcare","4.18.7-p2+tuxcare"],"bundled":2}],"products":[{"vendor":"craftcms","product":"cms"},{"vendor":"statamic","product":"cms"}],"references":[{"url":"https://www.hckrt.com/hacktivity/HCKRT-WM3VSE","tags":["third-party-advisory","technical-description","mitigation","advisory"]},{"url":"https://github.com/craftcms/cms/releases/tag/5.11.2","tags":["release-notes","advisory"]},{"url":"https://github.com/craftcms/cms","tags":["product","package"]},{"url":"https://github.com/craftcms/cms/security/advisories/GHSA-9hp6-3565-gvh5","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115935","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-j6hf-w48h-c9f9"},{"url":"https://packagist.org","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115935.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-115935","title":"Control panel only API response emulation replaces \"securityKey\" and reaches server RCE","description":"The app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user.\n\n\n\nA non-admin user with only accessCp can place newline characters in X-Craft-Plugin-Licenses. Craft passes this value to its .env writer without removing the newlines.\n\n\n\nThis lets the user insert a new attacker-known CRAFT_SECURITY_KEY into .env. After Craft loads that key, the user can forge a signed login redirect containing a Twig system() callback.\n\n\n\nThis is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.","status":"published","published":"2026-10-23T21:40:57.592Z","modified":"2026-11-02T14:45:41.313Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T18:00:08.034842Z"}],"euvd":[{"id":"EUVD-2026-109191","description":"The app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user.\n\n\n\nA non-admin user with only accessCp can place newline characters in X-Craft-Plugin-Licenses. Craft passes this value to its .env writer without removing the newlines.\n\n\n\nThis lets the user insert a new attacker-known CRAFT_SECURITY_KEY into .env. After Craft loads that key, the user can forge a signed login redirect containing a Twig system() callback.\n\n\n\nThis is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.","status":"published","published":"2026-10-23T21:40:57Z","modified":"2026-11-02T14:45:41Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:58:44.835214Z"}],"ghsa":[{"id":"GHSA-j6hf-w48h-c9f9","title":"The app/process-api-response-headers action accepts fake Craft API response headers from any...","description":"The app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user.\n\n\n\nA non-admin user with only accessCp can place newline characters in X-Craft-Plugin-Licenses. Craft passes this value to its .env writer without removing the newlines.\n\n\n\nThis lets the user insert a new attacker-known CRAFT_SECURITY_KEY into .env. After Craft loads that key, the user can forge a signed login redirect containing a Twig system() callback.\n\n\n\nThis is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.","status":"published","published":"2026-10-24T00:32:35Z","modified":"2026-10-24T00:32:40Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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":"high"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T15:14:20.706608Z"}],"nvd":[{"id":"CVE-2026-115935","description":"The app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user.\n\n\n\nA non-admin user with only accessCp can place newline characters in X-Craft-Plugin-Licenses. Craft passes this value to its .env writer without removing the newlines.\n\n\n\nThis lets the user insert a new attacker-known CRAFT_SECURITY_KEY into .env. After Craft loads that key, the user can forge a signed login redirect containing a Twig system() callback.\n\n\n\nThis is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.","status":"published","published":"2026-10-23T22:16:59.29Z","modified":"2026-11-02T15:17:15.943Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T20:51:42.579129Z"}],"osv":[{"id":"CVE-2026-115935","title":"Control panel only API response emulation replaces \"securityKey\" and reaches server RCE","description":"The app/process-api-response-headers action accepts fake Craft API response headers from any authenticated control panel user.\n\n\n\nA non-admin user with only accessCp can place newline characters in X-Craft-Plugin-Licenses. Craft passes this value to its .env writer without removing the newlines.\n\n\n\nThis lets the user insert a new attacker-known CRAFT_SECURITY_KEY into .env. After Craft loads that key, the user can forge a signed login redirect containing a Twig system() callback.\n\n\n\nThis is different from the previous report. That report reads the existing key through a Twig sandbox bypass. This report replaces the key through fake API headers and CRLF injection. Fixing either source does not fix the other.","status":"published","published":"2026-10-23T21:40:57.592Z","modified":"2026-11-04T02:30:29.981241007Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-94"],"updated_at":"2026-11-04T02:55:01.518827Z"},{"id":"CLSA-2026-1793192483","title":"TuxCare security update for craftcms/cms (2 CVEs)","description":"TuxCare rebuilt craftcms/cms to address 2 CVEs. Fixed in 4.18.7-p3+tuxcare.","status":"published","published":"2026-10-28T13:01:23Z","modified":"2026-10-28T19:45:10.200400745Z","updated_at":"2026-11-02T15:43:55.34846Z"}]}}