EUVD-2026-55994
GHSA-75j5-9v4m-c666
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/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
Network-delivered CSRF requiring victim to visit attacker page (UI:R), no privileges needed to craft attack (PR:N), low integrity impact limited to account social actions, no confidentiality or availability impact.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/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
Lifecycle Timeline
2DescriptionCVE.org
Affected versions of MISP cti-transmute expose several state-changing account operations as GET requests:
* /account/follow
* /account/delete_notification
* /account/mark_notification_read
* /account/mark_all_read
These endpoints require authentication, but before the fix they could be invoked with simple GET requests. That makes them susceptible to cross-site request forgery because a third-party site can induce the victim’s browser to send authenticated GET requests automatically.
The patch converts the actions to POST or DELETE and updates the frontend to include an X-CSRFToken header, providing explicit CSRF protection for those state-changing operations.
AnalysisAI
Cross-site request forgery in MISP cti-transmute exposes four authenticated account endpoints - /account/follow, /account/delete_notification, /account/mark_notification_read, and /account/mark_all_read - to silent browser-driven invocation via malicious third-party pages. Because these state-changing operations were implemented as HTTP GET routes, any authenticated user visiting an attacker-controlled page could have follows added, notifications deleted, or notification state altered without consent. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must have an active authenticated session on the cti-transmute instance at the time they visit the attacker-controlled page - unauthenticated users cannot be exploited since the endpoints require authentication. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 (Medium) is consistent with the actual impact envelope: the vulnerability requires authenticated victim interaction (UI:P) and produces only low integrity impact (VI:L) - account social actions rather than data theft or system compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers an account on the cti-transmute instance and identifies their user_id, then embeds JavaScript in a phishing email or compromised webpage that silently issues a POST (or, pre-patch, a GET) to /account/follow?user_id=ATTACKER_ID when an authenticated analyst visits. The victim's browser sends the request with their active session cookie, causing the platform to record a follow relationship without the analyst's awareness. … |
| Remediation | Apply the upstream patch available at https://github.com/MISP/cti-transmute/commit/c352c2329e48ccc33a2b96d5353450cfbf7e89ec, which converts /account/follow to POST, /account/delete_notification to DELETE, and /account/mark_notification_read and /account/mark_all_read to POST, with X-CSRFToken header enforcement added to all corresponding frontend fetch() calls. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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