CVE-2025-62716: Plane Project Management XSS Vulnerability

CVE-2025-62716 Overview

CVE-2025-62716 is an open redirect vulnerability in Plane, an open-source project management platform. The flaw exists in the ?next_path query parameter, which is passed directly to router.push without scheme validation. Attackers can supply arbitrary schemes such as javascript:, turning the open redirect into a cross-site scripting (XSS) flaw [CWE-79]. Exploitation requires no authentication but does require user interaction with a crafted link. Successful exploitation enables arbitrary JavaScript execution in the victim's browser, leading to information disclosure, privilege escalation, and modification of administrative settings. The issue is patched in Plane version 1.1.0.

Critical Impact

Unauthenticated attackers can execute arbitrary JavaScript in a victim's browser through a crafted next_path parameter, enabling session theft, privilege escalation, and administrative changes.

Affected Products

• Plane (makeplane/plane) versions prior to 1.1.0
• Self-hosted Plane deployments using vulnerable releases
• Plane Community Edition and related distributions prior to the patched release

Discovery Timeline

• 2025-10-24 - CVE-2025-62716 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-62716

Vulnerability Analysis

The vulnerability resides in Plane's client-side navigation logic. The application reads the next_path query parameter from incoming URLs and forwards the value into router.push without validating the URL scheme. Because router.push accepts any string, an attacker can specify a javascript: URI instead of a relative application path. When the victim's browser follows the redirect, the JavaScript scheme executes in the origin context of the Plane application.

This transforms a typical open redirect into a stored execution primitive within the authenticated session. Arbitrary scripts can read session tokens, call internal APIs, and alter workspace or administrative configuration. The vulnerability is categorized as Improper Neutralization of Input During Web Page Generation [CWE-79].

Root Cause

The root cause is missing input validation on the next_path parameter. The application trusts user-controlled redirect targets and does not enforce an allowlist of safe schemes such as http:, https:, or relative paths beginning with /. Passing an unvalidated string to router.push permits non-navigational schemes including javascript: and data:.

Attack Vector

An attacker crafts a Plane URL containing a malicious next_path value, for example a link pointing to a login or authentication-handling route that appends ?next_path=javascript:<payload>. The attacker delivers the link through phishing, chat, or third-party content. When an authenticated Plane user clicks the link, the redirect handler invokes router.push with the attacker's payload, executing JavaScript in the Plane origin. The script can then call internal endpoints to escalate privileges, modify administrative settings, or exfiltrate workspace data.

No verified public exploit code is available. See the GitHub Security Advisory for technical details from the maintainers.

Detection Methods for CVE-2025-62716

Indicators of Compromise

• Web server or proxy logs containing requests with next_path=javascript:, next_path=data:, or other non-HTTP schemes in the query string.
• URL-encoded variants such as next_path=javascript%3A or next_path=%2F%2Fattacker.tld appearing in access logs.
• Unexpected outbound requests from authenticated user sessions to attacker-controlled domains shortly after a redirect.
• Administrative setting changes or role modifications that do not correlate to legitimate admin activity.

Detection Strategies

• Inspect application and reverse proxy logs for next_path values that do not begin with a single / followed by an alphanumeric path segment.
• Deploy a web application firewall rule that blocks query parameters containing javascript:, data:, or vbscript: schemes.
• Correlate authentication events with subsequent admin API calls originating from the same session to surface privilege abuse following a click.

Monitoring Recommendations

• Enable Content Security Policy (CSP) reporting to capture inline script execution attempts and javascript: URI navigations.
• Forward Plane access logs to a centralized analytics platform and alert on anomalous next_path values.
• Monitor audit logs for administrative configuration changes and workspace permission updates against an established baseline.

How to Mitigate CVE-2025-62716

Immediate Actions Required

• Upgrade Plane to version 1.1.0 or later on all self-hosted instances.
• Audit administrative settings, user roles, and workspace permissions for unauthorized changes made before patching.
• Invalidate active user sessions after upgrading to force re-authentication.
• Notify users to avoid clicking Plane links received from untrusted sources until the upgrade is complete.

Patch Information

The maintainers released a fix in Plane version 1.1.0. The patch enforces validation on the next_path parameter so that only same-origin relative paths are accepted by router.push. Refer to the GitHub Security Advisory GHSA-6fj7-xgpg-mj6f for the official remediation guidance.

Workarounds

• If immediate upgrade is not feasible, deploy a reverse proxy rule that strips or rejects requests where next_path does not start with /.
• Apply a strict Content Security Policy that disallows inline script execution and javascript: URIs.
• Restrict access to the Plane instance to trusted networks or VPN-connected users until the patch is applied.

# Example NGINX rule to block non-relative next_path values
if ($arg_next_path !~ "^/[A-Za-z0-9_\-/]*$") {
    return 400;
}