CVE-2026-95703 MISP OrganisationsController File Existence and Image-Type Oracle via Forged Upload tmp_name
Authenticated site-admins can determine file existence and image types on the server via a file upload oracle in MISP.
- 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-2026-95703?
CVE-2026-95703 is a medium-severity vulnerability in MISP, published on 22 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
In MISP, the OrganisationsController::__uploadLogo method processed a caller-supplied tmp_name value with filesystem probes (file_exists, MIME type detection, EXIF reading) before verifying that the value corresponded to a genuine PHP file upload via is_uploaded_file. An authenticated site-admin user could supply an arbitrary server file path as the tmp_name parameter. The application would then probe that path and return distinct validation error messages depending on whether the file existed and what its image type was, effectively creating a file-existence and image-type oracle against the server filesystem.
The vulnerability requires site-admin privileges and does not allow arbitrary file read, code execution, or modification; the impact is limited to disclosure of whether a given path exists on the server and, for image files, their type.
Which versions are affected by CVE-2026-95703?
How do I fix CVE-2026-95703?
No fix has been published for CVE-2026-95703 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-95703 being exploited?
There is no known exploitation of CVE-2026-95703 in the wild and no public exploit code.
Sources
Also known as GHSA-f4j8-7jmm-g7jj.