CVE-2026-0649: InvoiceNinja SSRF Vulnerability

CVE-2026-0649 Overview

A Server-Side Request Forgery (SSRF) vulnerability has been identified in Invoice Ninja, an open-source invoicing and billing application. The vulnerability exists in the copy function within the /app/Jobs/Util/Import.php file, specifically in the Migration Import component. By manipulating the company_logo argument, an authenticated attacker with high privileges can initiate arbitrary server-side HTTP requests, potentially accessing internal resources or services that would otherwise be inaccessible from external networks.

Critical Impact

Authenticated attackers can exploit this SSRF vulnerability to probe internal network infrastructure, access internal services, or potentially exfiltrate sensitive data through controlled outbound requests from the server.

Affected Products

• Invoice Ninja versions up to and including 5.12.38
• Invoice Ninja Migration Import component
• Systems utilizing the /app/Jobs/Util/Import.php file

Discovery Timeline

• 2026-01-07 - CVE-2026-0649 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2026-0649

Vulnerability Analysis

This vulnerability is classified as CWE-918 (Server-Side Request Forgery). The SSRF flaw resides in the migration import functionality of Invoice Ninja, specifically within the copy function that processes the company_logo parameter. When users import migration data, the application fails to properly validate and sanitize the URL provided for the company logo, allowing attackers to specify arbitrary URLs that the server will then fetch.

The vulnerability requires network access and high privileges (authenticated administrative access) to exploit, which limits the attack surface. However, once exploited, an attacker can leverage the server's network position to make requests to internal services, cloud metadata endpoints (such as AWS IMDSv1 at 169.254.169.254), or other internal infrastructure that trusts requests originating from the application server.

Root Cause

The root cause of this vulnerability is insufficient input validation and URL sanitization in the copy function within /app/Jobs/Util/Import.php. The company_logo parameter accepts arbitrary URLs without proper validation to ensure they point to legitimate external resources. The application does not implement allowlist-based URL filtering, protocol restrictions, or internal network range blocking, which would prevent SSRF attacks.

Attack Vector

The attack is remotely exploitable through the network. An authenticated user with administrative privileges can initiate the attack by:

1. Accessing the migration import functionality in Invoice Ninja
2. Crafting a malicious migration payload containing a specially crafted company_logo URL
3. Pointing the URL to internal resources (e.g., http://localhost:8080/admin, http://192.168.1.1/, or cloud metadata endpoints)
4. Submitting the migration import request, causing the server to fetch the malicious URL
5. Observing responses or leveraging timing attacks to enumerate internal services

The vulnerability has been publicly disclosed, and technical details are available through the HXLab Document Share. Additional vulnerability tracking information is available through VulDB entry #339720.

Detection Methods for CVE-2026-0649

Indicators of Compromise

• Unusual outbound HTTP requests from the Invoice Ninja server to internal IP ranges (e.g., 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16)
• Requests to cloud metadata endpoints such as 169.254.169.254 from the application server
• Migration import operations with suspicious company_logo URLs pointing to non-standard destinations
• Error logs indicating failed connections to internal services during migration import operations

Detection Strategies

• Implement network monitoring to detect outbound requests from the Invoice Ninja server to internal network ranges or localhost
• Configure web application firewalls (WAF) to inspect and alert on SSRF attack patterns in request parameters
• Enable detailed logging for the migration import functionality to capture all URL fetch attempts
• Deploy intrusion detection systems (IDS) rules to identify SSRF exploitation attempts

Monitoring Recommendations

• Monitor application logs for migration import operations with external or suspicious URLs in the company_logo field
• Set up alerts for any outbound connections from the Invoice Ninja server to RFC 1918 private address spaces
• Review DNS query logs from the application server for unusual internal hostname resolution attempts
• Implement anomaly detection for atypical HTTP request patterns originating from the Invoice Ninja application

How to Mitigate CVE-2026-0649

Immediate Actions Required

• Update Invoice Ninja to a version newer than 5.12.38 when a patch becomes available
• Implement network-level controls to restrict outbound connections from the Invoice Ninja server to only necessary external services
• Disable or restrict access to the migration import functionality until patched
• Review existing migration imports for any signs of exploitation

Patch Information

No official patch has been released at the time of this advisory. The vendor was contacted early about this disclosure but did not respond. Organizations should monitor the official Invoice Ninja releases and security advisories for updates. In the meantime, apply the workarounds listed below to reduce exposure.

For the latest information on this vulnerability, refer to VulDB CTI entry #339720.

Workarounds

• Implement a web application firewall (WAF) rule to block or sanitize requests containing internal IP addresses or suspicious URL schemes in migration import parameters
• Configure egress filtering at the network level to prevent the Invoice Ninja server from initiating connections to internal network ranges
• Restrict access to the migration import feature to only trusted administrators who require the functionality
• If cloud-hosted, block access to cloud metadata endpoints (e.g., 169.254.169.254) from the application server using security groups or firewall rules

# Example: Block outbound connections to internal networks using iptables
# Apply these rules on the Invoice Ninja server to prevent SSRF to internal resources

# Block connections to localhost
iptables -A OUTPUT -d 127.0.0.0/8 -m owner --uid-owner www-data -j DROP

# Block connections to private IPv4 ranges
iptables -A OUTPUT -d 10.0.0.0/8 -m owner --uid-owner www-data -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -m owner --uid-owner www-data -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -m owner --uid-owner www-data -j DROP

# Block cloud metadata endpoint (AWS/Azure/GCP)
iptables -A OUTPUT -d 169.254.169.254 -m owner --uid-owner www-data -j DROP