CVE-2026-94383 MISP Blocklist Workflow Module: Arbitrary Script Execution via Unrestricted File Extension
Site administrators can upload arbitrary script files via the blocklist workflow, leading to remote code execution if the web server executes scripts from the export directory.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-94383?
CVE-2026-94383 is a high-severity vulnerability in MISP, published on 21 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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: <2.5.47
Which versions are affected by CVE-2026-94383?
How do I fix CVE-2026-94383?
No fix has been published for CVE-2026-94383 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-94383 being exploited?
There is no known exploitation of CVE-2026-94383 in the wild and no public exploit code.
Sources
Also known as GHSA-8q25-97q9-g9wh.