CVE-2026-94374 in MISP
Summary
by MITRE • 09/21/2026
MISP contains an insecure direct object reference vulnerability in the processModuleResultsData method of the Event model. When processing module results, the code iterates over EventReport entries supplied in the resolved data and saves each one. Unlike the adjacent attribute and object processing loops, the report loop did not unset the client-supplied 'id' field before calling save(). Because the MISP EventReport model's create() method does not strip the id field, an authenticated user with permission to submit module results could include an 'id' value referencing an existing report belonging to a different event. Upon save(), the ORM would update that existing row rather than insert a new one, allowing the attacker to
- read the content of another event's report by reparenting it into their own event - overwrite the report's fields with attacker-controlled data - change the report's event_id to redirect ownership.
This constitutes an authorization bypass through a user-controlled key, enabling cross-event data disclosure and integrity compromise. The vulnerability requires an authenticated session with the ability to invoke module result processing on an event.
Version affected: <2.5.47
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Analysis
by VulDB Data Team • 09/21/2026
The identified security flaw resides within the MISP platform's Event model, specifically in the processModuleResultsData method which handles the ingestion and persistence of data generated by various analysis modules. This vulnerability is classified as an Insecure Direct Object Reference (IDOR), corresponding to CWE-639 in the Common Weakness Enumeration taxonomy. The core technical issue stems from a failure to sanitize user-supplied input before database operations, specifically regarding the 'id' field within EventReport entries. When the system processes module results, it iterates through provided report data and attempts to save each entry using an Object-Relational Mapping (ORM) mechanism. Unlike adjacent loops that handle attributes and objects which properly clear client-provided identifiers prior to saving, this specific loop fails to unset the 'id' field supplied by the authenticated user.
The operational impact of this oversight is significant because it allows for a bypass of authorization controls through manipulation of primary keys. In typical ORM behavior, if an identifier is present during a save operation, the system interprets the action as an update to an existing record rather than an insertion of a new one. Consequently, an authenticated user with permission to submit module results can inject an 'id' value that corresponds to an EventReport belonging to a different event within the MISP instance. Upon execution, the ORM updates the target row instead of creating a new entry for the current event. This mechanism enables three distinct malicious outcomes: first, the attacker can reparent an existing report into their own event context by altering its ownership; second, they can overwrite critical fields of another user's or organization's report with data under their control; and third, they can change the associated event_id to redirect the logical ownership of sensitive intelligence reports.
This vulnerability facilitates cross-event data disclosure and integrity compromise, effectively allowing an attacker to read confidential information from other events by reparenting them into a context where they have access. It also permits the corruption of critical threat intelligence records, which undermines the trustworthiness of the platform's shared indicators and analyses. The attack requires only an authenticated session with specific permissions to invoke module result processing on any event, making it accessible to lower-privileged users who might otherwise be restricted from viewing or modifying reports associated with other events. This represents a classic authorization bypass where user-controlled keys are used to manipulate resources outside the intended scope of access.
To mitigate this vulnerability, organizations running MISP must upgrade immediately to version 2.5.47 or later, which includes patches for this specific logic error in the Event model's processing routine. For environments that cannot yet patch due to operational constraints, temporary mitigations should focus on restricting module result submission permissions to only those users who absolutely require them, thereby reducing the attack surface. Additionally, implementing strict input validation at the application layer to reject any 'id' fields present in report data payloads can provide a defensive layer until the software update is applied. Monitoring logs for unusual patterns of event_id changes or unexpected updates to EventReport records may also aid in detecting exploitation attempts. This issue aligns with ATT&CK techniques related to Defense Evasion and Data Exfiltration, as it allows an actor to manipulate data integrity and access restricted information within a collaborative threat intelligence sharing platform.