CVE-2026-103237

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Source

https://cve.org/CVERecord?id=CVE-2026-103237

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103237.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-103237

Published

2026-09-30T09:56:35Z

Modified

2026-10-04T02:46:26Z

Severity

8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N CVSS Calculator

Summary

MISP: Nested Model Alias Key Bypasses Sanitization to Modify Cross-Tenant Rows

Details

MISP contains an improper input validation vulnerability in its ORM save path. When a user submits data through various endpoints (attribute add/edit, event edit, free-text import, sighting capture, shadow attribute proposal, event report creation, object reference add, user admin edit), the application sanitizes the flat record by stripping the primary key and pinning the event_id or object_id to the caller's context. However, the underlying ORM's set() method gives priority to a nested key whose name matches the model alias and discards the outer scalar fields.

An authenticated user with basic write permissions can exploit this by embedding a nested block under the model alias key inside their request. The sanitization logic (id removal, event_id pinning) is applied to the outer record, but the ORM binds to the inner record instead, which carries an attacker-chosen id and event_id. This allows the attacker to overwrite, re-parent, or soft-delete rows belonging to other organizations or events they have no read access to.

Impact:

Cross-tenant data integrity compromise (attribute values rewritten, objects re-parented to attacker events, rows soft-deleted)
Affects multiple entity types: Attribute, Object, EventReport, Sighting, AttributeTag, ShadowAttribute
Requires only a low-privilege authenticated account with perm_add

Affected versions: <2.5.48

Database specific

{
    "cna_assigner":  "CIRCL",
    "cwe_ids":  [
        "CWE-20",
        "CWE-639"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103237.json"
}

References

Affected packages

Git / github.com/misp/misp

Affected ranges

Type

GIT

Repo

https://github.com/misp/misp

Events

Introduced

Fixed

9485ae40d

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "2.5.48"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103237.json"