CVE-2026-25812: PlaciPy CSRF Vulnerability

CVE-2026-25812 Overview

CVE-2026-25812 is a Cross-Site Request Forgery (CSRF) vulnerability affecting PlaciPy, a placement management system designed for educational institutions. In version 1.0.0, the application enables credentialed CORS (Cross-Origin Resource Sharing) requests but does not implement any CSRF protection mechanism. This combination creates a dangerous attack surface where malicious websites can make authenticated requests on behalf of legitimate users.

Critical Impact

Attackers can exploit this vulnerability to perform unauthorized actions on behalf of authenticated users, potentially compromising student data, placement records, and administrative functions within educational institutions.

Affected Products

• PlaciPy version 1.0.0
• Educational institution placement management deployments using PlaciPy
• Any custom integrations relying on PlaciPy's credentialed CORS configuration

Discovery Timeline

• 2026-02-09 - CVE-2026-25812 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2026-25812

Vulnerability Analysis

This vulnerability combines two security misconfigurations that together create a significant attack surface. The application enables credentialed CORS requests, which means browsers will include authentication cookies when making cross-origin requests. Simultaneously, the application lacks any CSRF protection mechanism such as anti-CSRF tokens, SameSite cookie attributes, or origin validation.

When an application accepts credentials via CORS (using Access-Control-Allow-Credentials: true), it explicitly permits authenticated cross-origin requests. Without CSRF protections, any malicious website visited by an authenticated user can silently submit requests to the vulnerable application, and those requests will include the user's session cookies.

For an educational placement management system, this could allow attackers to modify student placement records, alter company hiring data, change user account settings, or access sensitive student and employer information.

Root Cause

The root cause is the failure to implement defense-in-depth security controls when enabling credentialed cross-origin requests. The application's CORS configuration allows credentials to be sent with cross-origin requests, but no complementary CSRF defense mechanism exists to validate that requests originate from legitimate user actions within the application itself.

This is classified as CWE-352 (Cross-Site Request Forgery), where the application fails to verify that submitted requests were intentionally made by the authenticated user.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction from the victim beyond being logged into the vulnerable application. An attacker can host a malicious webpage that, when visited by an authenticated PlaciPy user, automatically submits forged requests to the application. These requests would be processed as legitimate because the browser automatically includes the user's session credentials.

A typical attack scenario involves the attacker crafting a malicious page containing hidden forms or JavaScript fetch requests targeting PlaciPy endpoints. When a logged-in administrator or user visits this page, the attacker's requests execute with the victim's privileges. For detailed technical information, refer to the GitHub Security Advisory.

Detection Methods for CVE-2026-25812

Indicators of Compromise

• Unexpected modifications to student placement records or user account settings
• Audit logs showing state-changing requests originating from unusual referrer URLs or missing Origin headers
• User reports of unauthorized changes to their profiles or preferences
• Administrative actions performed without corresponding administrator login activity

Detection Strategies

• Monitor HTTP access logs for requests with suspicious or external Referer headers targeting sensitive endpoints
• Implement anomaly detection for state-changing requests that lack proper Origin header validation
• Review web application firewall (WAF) logs for patterns indicative of cross-site request attempts
• Audit session activity for requests that don't correlate with expected user interaction patterns

Monitoring Recommendations

• Enable detailed logging of all authentication-related and administrative actions
• Configure alerts for bulk modifications to placement records or user accounts
• Implement user activity monitoring to detect actions that don't match typical usage patterns
• Deploy browser-based telemetry to track unexpected cross-origin request behavior

How to Mitigate CVE-2026-25812

Immediate Actions Required

• Upgrade PlaciPy to a patched version when available from the vendor
• Implement anti-CSRF tokens on all state-changing forms and API endpoints
• Configure cookies with the SameSite=Strict or SameSite=Lax attribute to prevent cross-site cookie transmission
• Review and restrict CORS configuration to only trusted origins rather than allowing credentials from any origin

Patch Information

Monitor the official PlaciPy repository and the GitHub Security Advisory for patch releases addressing this vulnerability. Organizations should prioritize applying the security update once available and validate that CSRF protections are properly implemented after patching.

Workarounds

• Implement a reverse proxy or WAF rule to validate Origin and Referer headers on all state-changing requests
• Disable credentialed CORS requests (Access-Control-Allow-Credentials) if cross-origin authenticated requests are not required
• Restrict application access to trusted network segments or VPN-only access to limit external attack surface
• Implement custom CSRF token validation at the application layer if source code modifications are possible

# Example nginx configuration to validate Origin header
# Add to server block for PlaciPy application
map $http_origin $cors_valid {
    default 0;
    "https://trusted-domain.edu" 1;
}

location /api/ {
    if ($request_method != GET) {
        set $csrf_check "${cors_valid}";
        if ($csrf_check = 0) {
            return 403;
        }
    }
    proxy_pass http://placipy_backend;
}