CVE-2026-129248 in Akaunting
Summary
by MITRE • 11/14/2026
A weakness has been identified in Akaunting up to 3.3.0. The affected element is the function calculation_to_quantity of the file helpers.php of the component Invoice Item Validation. Executing a manipulation of the argument quantity can lead to numeric range comparison without minimum check. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 11/15/2026
The vulnerability identified in Akaunting versions up to 3.3.0 represents a significant security flaw within the Invoice Item Validation component, specifically residing in the calculation_to_quantity function located in the helpers.php file. This weakness stems from an improper handling of numeric inputs where the application fails to enforce minimum boundary checks before performing range comparisons or arithmetic operations on user-supplied data. The core technical issue is classified under CWE-190, which describes integer overflow or wraparound errors that can lead to unexpected behavior when values exceed expected limits. In this specific context, the manipulation of the quantity argument allows an attacker to supply a value that bypasses standard validation logic, potentially resulting in numeric range comparison without minimum checks as described by CWE-367. This lack of input sanitization means the application does not adequately verify whether the provided quantity falls within acceptable operational bounds before proceeding with calculations or database updates.
From an operational perspective, this vulnerability is exploitable remotely, allowing unauthenticated attackers to interact directly with the vulnerable endpoint via HTTP requests. The ability to manipulate the quantity parameter without proper validation can lead to a variety of adverse outcomes depending on how the downstream processes utilize this data. In accounting software like Akaunting, such inputs often influence financial calculations, inventory levels, or invoice totals. An attacker could potentially inject malformed numeric values that cause arithmetic errors, leading to incorrect financial reporting, corrupted database entries, or even application crashes if the resulting value causes a buffer overflow in underlying libraries. While direct code execution is not explicitly confirmed as the primary impact here, the integrity of financial data and system stability are severely compromised by this flaw. The remote nature of the attack vector means that no prior authentication is required to initiate these malicious inputs, significantly increasing the risk surface for organizations deploying vulnerable instances without additional network-level protections.
The vendor's failure to respond to early disclosure attempts exacerbates the risk landscape, leaving users with limited official mitigation options beyond upgrading or applying custom patches if available in later versions. Security practitioners should treat this as a critical issue requiring immediate attention due to its remote exploitability and potential impact on data integrity. Mitigation strategies primarily involve ensuring that all instances of Akaunting are updated to version 3.3.1 or higher, where the calculation_to_quantity function has presumably been hardened with proper input validation logic. For environments unable to upgrade immediately, network-level controls such as Web Application Firewalls can be configured to detect and block anomalous numeric inputs in invoice-related API endpoints or form submissions. Additionally, implementing strict server-side validation that enforces minimum quantity thresholds before any processing occurs is essential for securing the application against this specific class of input manipulation attacks.
This vulnerability aligns with several ATT&CK techniques related to initial access and impact phases. Specifically, it relates to technique T1190 Exploit Public-Facing Application, where attackers leverage weaknesses in internet-facing software to gain a foothold or cause disruption. The lack of minimum checks also reflects poor input validation practices often associated with CWE-20 Improper Input Validation. Organizations must prioritize patching this vulnerability to prevent potential financial discrepancies and maintain the trustworthiness of their accounting systems. Regular security audits focusing on numeric field handling in critical business logic functions are recommended to identify similar weaknesses across other modules within the application suite.