EUVD-2026-42736
GHSA-v64j-9r6x-4fv6
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network CSRF needs no attacker privileges (PR:N) but mandatory admin interaction (UI:R); config tampering chaining to PHP RCE yields high C/I/A, scope unchanged as impact stays within the app.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
1DescriptionCVE.org
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.
AnalysisAI
Cross-site request forgery in Cotonti Siena (versions 0.9.26 and earlier) lets remote attackers alter administrator configuration by luring an authenticated admin into loading an attacker-controlled page that auto-submits a forged POST to the admin.php config update handler, which never calls the CMS's own CSRF validation routine. The highest-value abuse sets the PFS module option pfsfilecheck to 0, disabling the file-extension whitelist so any account with PFS (Personal File Storage) access can upload and execute arbitrary PHP, turning a CSRF into server-side code execution. There is no public exploit identified at time of analysis and it is not on CISA KEV, though a referenced public gist may contain proof-of-concept details; EPSS was not provided.
Technical ContextAI
Cotonti Siena is a lightweight open-source PHP content-management framework; the affected surface is the administrative configuration endpoint exposed through admin.php. The root cause is CWE-352 (Cross-Site Request Forgery): the config-update handler processes state-changing POST requests without invoking Cotonti's built-in anti-CSRF token check (typically the sed_check_xg / x-parameter guard used elsewhere in the framework), so a request is trusted solely on the basis of the admin's session cookie, which the browser attaches automatically on cross-origin form submissions. The secondary escalation targets the PFS (Personal File Storage) module: its pfsfilecheck flag governs whether uploaded filenames are validated against an extension whitelist; forcing it to 0 removes the only barrier preventing .php uploads, and because uploaded files land in a web-accessible directory they can then be requested and executed by the PHP interpreter.
RemediationAI
Upgrade to a Cotonti Siena release later than 0.9.26 that adds CSRF-token validation to the admin.php config-update handler; no vendor-released fixed version number was provided in the input, so consult the VulnCheck advisory (https://www.vulncheck.com/advisories/cotonti-siena-csrf-via-admin-php-config-update-endpoint) and the official Cotonti project channels for the exact patched build before deploying - do not assume a version that is not confirmed. Until a confirmed patch is applied, compensating controls include: enforce the framework's anti-CSRF token check on the configuration endpoint (add the sed_check_xg/x-parameter guard) if maintaining a local patch is feasible; restrict admin.php access by source IP or place it behind a VPN/authenticated reverse proxy so cross-site form posts from arbitrary origins cannot reach it; and as a defense for the escalation path, disable the PFS module or tightly limit which accounts hold PFS upload rights and verify pfsfilecheck remains 1, and configure the web server to refuse PHP execution within PFS upload directories (e.g. via a per-directory handler override). Trade-offs: IP/VPN restriction breaks remote administration from untrusted networks, disabling PFS removes user file-storage functionality, and blocking PHP execution in upload paths is the most robust mitigation but must be validated against the actual storage location.
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External POC / Exploit Code
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