Vulnerability · Published Jul 9, 2026 · Assigned by VulnCheck
CVE-2026-58143Cotonti Siena 0.9.26 CSRF via admin.php Config Update Endpoint
High 8.8
In plain English
A high-severity cross-site request forgery in Cotonti from Cotonti. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
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.
Affected products (as reported)
Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- Researcher Disclosure technical-description, exploit
- https://www.vulncheck.com/advisories/cotonti-siena-csrf-via-admin-php-config-update-endpoint third-party-advisory