CVE-2026-86347 MISP Missing Authorization on Template File Upload Allows Authenticated Disk Exhaustion
Authenticated users can upload files to exhaust disk space due to missing authorization checks on the template upload endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86347?
CVE-2026-86347 is a high-severity missing authorization vulnerability in Misp-Project Misp, published on 7 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Affected versions of MISP allow any authenticated user to access TemplatesController::uploadFile() because the ACL entry for templates/uploadFile used the wildcard *. This bypasses the intended role restrictions applied to neighboring template-management operations.
The upload handler accepts arbitrary content with only minimal checks and writes it into app/tmp/files/. A low-privileged or read-only user can therefore repeatedly upload files and consume server disk space without requiring perm_add or perm_template. The fix changes the ACL requirement from * to perm_add.
The commit also rules out stronger impacts: uploaded files receive random names, path traversal/predictable overwrite is not available, the temporary directory is outside the web root, and the files are not directly served over HTTP. Therefore, the issue should not be described as arbitrary file overwrite, stored XSS, or RCE.
Version affected: ≤2.5.45
Which versions are affected by CVE-2026-86347?
It affects 1 product.
Products include Misp-Project Misp.
How do I fix CVE-2026-86347?
No fix has been published for CVE-2026-86347 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-86347 being exploited?
There is no known exploitation of CVE-2026-86347 in the wild and no public exploit code.
Other vulnerabilities in Misp-Project Misp
Sources
Also known as GHSA-798c-m5xg-4gf8.