Introduction
A single unauthenticated HTTP request to Manager-io/Manager accounting software can give a remote attacker access to sensitive internal resources and cloud metadata. The critical flaw bypasses network isolation and reaches internal services directly, which exposes organizations to the risk of data exfiltration and lateral movement.
About Manager-io/Manager: Manager-io develops Manager, a cross-platform open-source accounting suite for small and medium businesses. It comes as a free Desktop Edition and as paid Server and Cloud Editions, and it runs on Windows, macOS, and Linux. Manager is not a dominant player in the global accounting software market, but it is widely used in niche business environments and has a broad feature set for financial management (10, 34).
Technical Information
Vulnerability Mechanism
CVE-2025-54122 is a critical Server-Side Request Forgery (SSRF) vulnerability in the proxy handler component of Manager-io/Manager. The root cause is improper validation of user-supplied URLs. The proxy handler does not adequately restrict or sanitize the url parameter, so a remote unauthenticated attacker can force the server to make arbitrary HTTP requests on their behalf (21, 35).
Attack Vector and Exploitation
An attacker can exploit this flaw by sending a crafted HTTP request to the vulnerable proxy handler endpoint. For example:
GET /proxy?url=http://169.254.169.254/latest/meta-data/ HTTP/1.1 Host: victim-server
This request makes the Manager server fetch data from the AWS instance metadata service, which can expose sensitive cloud credentials and configuration details. The same technique can reach internal-only services, such as databases, administrative interfaces, or other systems not exposed to the public internet. Because the attack requires no authentication and can be run remotely, its impact is high (25, 23).
Impact
Successful exploitation allows an attacker to:
- Read sensitive data from cloud metadata endpoints (e.g., AWS, Azure)
- Access internal network services behind firewalls
- Enumerate internal IP ranges and services
- Exfiltrate confidential information from isolated network segments
Affected Code Pattern
Public advisories do not include the vulnerable code. They describe the vulnerability as a failure to restrict the url parameter in the proxy handler, which results in full read SSRF (CWE-918).
Affected Systems and Versions
- Products: Manager-io/Manager accounting software
- Editions: Desktop and Server Editions
- Versions: All versions up to and including 25.7.18.2519
- Cloud Edition: Not affected (vendor-managed)
Patch Information
Manager version 25.7.21.2525 fixes the vulnerability. Users must upgrade to this version or later to remediate it. The patch adds strict input validation to the proxy handler, blocks requests to reserved IP ranges and metadata endpoints, and requires authentication for proxy functionality (21, 35).
Upgrade Steps:
- Download the latest Manager release from the official site or GitHub.
- Install version 25.7.21.2525 or later on all affected systems.
Workarounds for Unpatched Systems:
- Restrict outbound HTTP/HTTPS from Manager servers using firewall rules
- Block access to 169.254.169.254 and internal subnets
- Deploy reverse proxies with input validation
- Disable the proxy handler if you do not need it (25)
Vendor Security History
The available sources show no previous vulnerabilities and no formal security policy for Manager-io/Manager. The vendor released a patch and advisory within days of discovery. The response was prompt, but there is no sign of an established security maturity model (33).
References
- NVD Entry for CVE-2025-54122
- Official GitHub Security Advisory
- Manager-io/Manager GitHub Repository
- Manager Release Notes
- Manager Download Page
- PortSwigger SSRF Cheat Sheet
- CWE-918: Server-Side Request Forgery
Source: This report was created using AI
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