CVE-2026-33163
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.
Executive Summary
CVE-2026-33163 is a medium severity vulnerability affecting pii-secrets, appsec. It is classified as Information Exposure. Ensure your systems and dependencies are patched immediately to mitigate exposure risks.
Precogs AI Insight
"The primary vulnerability vector is rooted in within Parse Server, allowing the insecure processing of malicious payloads. Adversaries commonly weaponize this defect by escalate their own privileges to administrative levels without proper credentials. By scanning all web responses and configuration files, Precogs is able to identify exploitable weaknesses before attackers do."
What is this vulnerability?
CVE-2026-33163 is categorized as a critical Code Injection / RCE flaw. Based on our vulnerability intelligence, this issue occurs when the application fails to securely handle untrusted data boundaries.
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.35 and 8.6.50, when a `Parse.C...
This architectural defect enables adversaries to bypass intended security controls, directly manipulating the application's execution state or data layer. Immediate strategic intervention is required.
Risk Assessment
| Metric | Value |
|---|---|
| CVSS Base Score | 6.5 (MEDIUM) |
| Vector String | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| Published | March 18, 2026 |
| Last Modified | March 19, 2026 |
| Related CWEs | CWE-200 |
Impact on Systems
✅ Remote Code Execution: Attackers achieve arbitrary command execution within the context of the application server.
✅ Privilege Escalation: Initial code execution can be exploited to pivot and elevate privileges across the network.
✅ Persistent Backdoors: Attackers can bind reverse shells, modify source files, or inject persistent access mechanisms.
How to fix this issue?
Implement the following strategic mitigations immediately to eliminate the attack surface.
1. Remove Dynamic Evaluation Completely eliminate the use of dynamic evaluation functions (eval(), exec(), system()) on untrusted input.
2. Sandboxing If dynamic execution is an absolute business requirement, isolate the execution environment in tightly constrained, non-networked sandboxes (e.g., restricted WebAssembly or isolated containers).
3. Network Segmentation Restrict outbound traffic from the application server (egress filtering) to prevent reverse shell connections.
Vulnerability Signature
// Vulnerable Node.js Execution
const exec = require('child_process').exec;
const user_domain = req.query.domain;
// VULNERABLE: Injecting user input directly into system shell commands
exec('ping -c 4 ' + user_domain, (error, stdout, stderr) =\> \{
res.send(stdout);
\});
// EXPLOIT PAYLOAD: precogs.ai ; cat /etc/passwd
References and Sources
- NVD — CVE-2026-33163
- MITRE — CVE-2026-33163
- CWE-200 — MITRE CWE
- CWE-200 Details
- PII and Secrets Exposure
- Application Security Vulnerabilities
Vulnerability Code Signature
Attack Data Flow
| Stage | Detail |
|---|---|
| Source | Application error or debug endpoint |
| Vector | Verbose error messages or sensitive metadata returned to the client |
| Sink | HTTP response |
| Impact | Information gathering, aids in further attacks |
Vulnerable Code Pattern
# ❌ VULNERABLE: Information Exposure
@app.errorhandler(500)
def internal_error(error):
# Taint sink: returns stack trace to user
return f"Internal Server Error: {error}", 500
Secure Code Pattern
# ✅ SECURE: Generic error message
@app.errorhandler(500)
def internal_error(error):
# Log the detailed error internally
app.logger.error(f"Server Error: {error}")
# Return a generic message to the user
return "An internal server error occurred.", 500
How Precogs Detects This
Precogs API Security Engine comprehensively audits all web endpoints to ensure verbose error messages and sensitive metadata are not exposed.\n