{"cve":"CVE-2026-91857","nvd":{"published":"2026-09-15T10:17:06.267","modified":"2026-09-16T13:42:48.977","status":"Deferred","description":"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 - 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","cvss_v4":{"vector":"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","score":5.3},"cvss_v3":null,"cwes":["CWE-352"],"references":["https://github.com/MISP/MISP/commit/b4a5486b5"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-91857","score":0.00214,"percentile":0.11824,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}