CVE-2025-55579 in SolidInvoice
Summary
by MITRE • 08/29/2025
A vulnerability was identified in SolidInvoice up to 2.4.0. The affected element is an unknown function of the file /tax/rates of the component Tax Rates Module. Such manipulation of the argument Name leads to cross site scripting. The attack can be executed remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 09/02/2026
The vulnerability identified in SolidInvoice versions up to 2.4.0 represents a significant security risk within the Tax Rates Module, specifically affecting an unknown function associated with the /tax/rates endpoint. This flaw is classified as a Stored Cross-Site Scripting (XSS) vulnerability, which falls under CWE-79: Improper Neutralization of Input During Web Page Generation in the Common Weakness Enumeration standard. The core technical issue stems from insufficient input validation and sanitization mechanisms when processing the Name argument passed to this specific endpoint. When an attacker submits malicious script content as part of the Name parameter, the application fails to properly escape or neutralize special characters such as angle brackets, quotes, and ampersands before storing the data in its backend database or rendering it back into HTML responses for other users.
This architectural deficiency allows attackers to inject executable JavaScript code that persists on the server side rather than being executed only within a single session context. Because SolidInvoice is an invoicing platform handling sensitive financial data, the impact of this vulnerability extends beyond simple defacement or cookie theft. An attacker can craft a malicious payload designed to steal administrative credentials by exfiltrating session cookies via HTTP requests to external servers controlled by the adversary. Furthermore, given that tax rate configurations are often managed by administrators with elevated privileges, successful exploitation could lead to full system compromise if the injected script performs actions on behalf of an authenticated admin user without requiring additional authentication steps for critical operations.
The operational impact is severe due to the remote nature of the attack and the availability of public exploits. Since the vulnerability can be triggered remotely over HTTP or HTTPS, no physical access or local network proximity is required from the attacker's perspective. The existence of publicly available exploit code significantly lowers the barrier to entry for malicious actors who may lack advanced programming skills but possess automated scanning tools capable of probing vulnerable instances across the internet. This increases the likelihood of widespread compromise among organizations using unpatched versions of SolidInvoice, particularly those that have not implemented additional web application firewall rules or input filtering layers at the infrastructure level.
From a threat intelligence perspective aligned with MITRE ATT&CK frameworks, this vulnerability facilitates techniques related to Client-Side Scripting Injection and potentially Credential Access through Browser Session Hijacking. Attackers leveraging this flaw can establish persistent access by embedding scripts that load additional malicious modules or keyloggers into the administrative interface every time an authorized user views the affected tax rate list. The lack of response from the vendor since early disclosure further exacerbates the risk profile, leaving users without official patches or guidance on temporary mitigations until a fixed version is released.
To mitigate this vulnerability in the absence of immediate patching, administrators should implement strict input validation rules at the application layer to reject any Name field containing HTML tags or JavaScript event handlers. Deploying a Web Application Firewall with signatures capable of detecting and blocking XSS payloads targeting tax-related endpoints can provide an additional layer of defense. Additionally, enabling Content Security Policy headers that restrict script execution sources may help limit the damage if an injection attempt succeeds by preventing inline scripts from running unless explicitly whitelisted. Organizations should also consider upgrading to a newer version of SolidInvoice as soon as it becomes available and monitor vendor communications for official security advisories addressing this specific flaw in the Tax Rates Module.