CVE-2026-58143 Cotonti Siena 0.9.26 CSRF via admin.php Config Update Endpoint
Attackers can trick admins into disabling file upload restrictions, allowing arbitrary PHP execution via forged requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-58143?
CVE-2026-58143 is a high-severity vulnerability in Cotonti, published on 9 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Cotonti Siena 0.9.26 and earlier contains a cross-site request forgery vulnerability that allows unauthenticated attackers to modify administrator configuration by tricking a logged-in administrator into submitting a forged POST request to the admin.php config update handler, which never invokes the application's CSRF validation function. Attackers can disable the PFS module's file extension whitelist by setting pfsfilecheck to 0, enabling any user with PFS access to upload and execute arbitrary PHP files on the server.
Weakness: CWE-352
Which versions are affected by CVE-2026-58143?
How do I fix CVE-2026-58143?
No fix has been published for CVE-2026-58143 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-58143 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58143 exists.
Sources
Also known as GHSA-v64j-9r6x-4fv6.