{"id":"CVE-2026-91857","title":"Affected versions of MISP expose several state-changing controller actions without restricting them to POST.\n\n\nThe affected actions are:\n\n\n\n - EventReportsController::purgeUnusedPictures()\n\n - NoticelistsController::enableNoticelist()\n\n …","summary":"Affected versions of MISP expose several state-changing controller actions without restricting them to POST.\n\n\nThe affected actions are:\n\n\n\n - EventReportsController::purgeUnusedPictures()\n\n - NoticelistsController::enableNoticelist()\n\n …","severity":"medium","cvss":5.3,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","cwe":["CWE-352"],"vendor":"MISP","product":"MISP","affected":["MISP < 2.5.46"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T13:42:48.977","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91857","references":[{"url":"https://github.com/MISP/MISP/commit/b4a5486b5","label":"5a6e4751-2f3f-4070-9419-94fb35b644e8"}],"tags":["nvd","cve.org"],"epss":0.00214,"epssPercentile":0.10448,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T13:10:25.729586Z"},"cvssSource":"cna","ingestedAt":"2026-09-15T09:34:49.387Z","slug":"CVE-2026-91857","body":"## Overview\n\nAffected versions of MISP expose several state-changing controller actions without restricting them to POST.\n\n\nThe affected actions are:\n\n\n\n - EventReportsController::purgeUnusedPictures()\n\n - NoticelistsController::enableNoticelist()\n\n - ServersController::removeOrphanedCorrelations()\n\n - WorkflowsController::rebuildRedis()\n\n\n\n\n\n\nThe patch adds allowMethod(['post']) to each action, preventing them from being triggered through ordinary GET requests.\n\n\nFor purgeUnusedPictures(), the corresponding UI previously used $.get(). The fix converts that request to POST and supplies X-CSRF-Token, while the controller enables header-only CSRF validation for that AJAX action.\n\n\nBecause GET requests can be induced cross-origin through links, images, redirects, or navigation, accepting GET for these state-changing operations can let an attacker trigger them using the authenticated victim's session.\n\nVersion affected: ≤2.5.45\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}