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CVE-2026-94383: MISP

Severity

8.6 (HIGH)

Vendor

MISP

Affected versions

0 through before 2.5.47

Patch status

Unknown

Published

2026-09-21T13:17:13.560

Modified

2026-09-21T15:17:39.433

Why it matters

This matters because the affected product may allow code execution. Prioritize systems that are internet-facing or have privileged access to other infrastructure.

Recommended admin actions

• Review and patch based on exposure, asset criticality, and business impact.

Technical summary

The MISP blocklist workflow module accepted a user-supplied blocklist filename parameter without validating the file extension. The only sanitization applied was basename() to strip path components and a check for empty or dot values. A site administrator could specify a filename with an arbitrary extension that would be placed in the MISP export directory. If the underlying web server is configured to interpret and execute scripts from that directory, the resulting file could be invoked, leading to arbitrary code execution in the context of the web server process. The vulnerability requires the attacker to hold site-administrator privileges within MISP, as the blocklist workflow module is restricted to that role. No additional user interaction is required beyond triggering the workflow action with a crafted filename parameter. The impact is full compromise of the MISP server's confidentiality, integrity, and availability, as arbitrary script execution grants the attacker the same privileges as the web server user. Version affected:

View the official NVD record for CVE-2026-94383

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.