CVE-2026-91857
MISP: State-changing actions accessible via GET request enabling CSRF
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 15, 2026
- Updated
- Sep 15, 2026
- Reserved
- Sep 15, 2026
Description
Affected versions of MISP expose several state-changing controller actions without restricting them to POST.
The affected actions are:
- EventReportsController::purgeUnusedPictures()
- NoticelistsController::enableNoticelist()
- ServersController::removeOrphanedCorrelations()
- WorkflowsController::rebuildRedis()
The patch adds allowMethod(['post']) to each action, preventing them from being triggered through ordinary GET requests.
For 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.
Because 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.
Version affected: ≤2.5.45
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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 | CIRCL |
Weaknesses
- CWE-352 Cross-Site Request Forgery (CSRF)
Affected Products
| Product | Versions |
|---|---|
MISPMISP |
|
References
- Security patchpatch
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