CVE-2026-26746

HighPublic PoC

Published: 20 February 2026

Published

20 February 2026

Modified

24 February 2026

KEV Added

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Patch

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CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0057 43.0th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-26746 is a high-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Opensourcepos Open Source Point Of Sale. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 43.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-26746 is a Local File Inclusion (LFI) vulnerability in OpenSourcePOS version 3.4.1, specifically within the Sales.php::getInvoice() function. By manipulating the Invoice Type configuration, an attacker can read arbitrary files on the affected web server. This issue, published on 2026-02-20, carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and is linked to CWE-434.

The vulnerability can be exploited over the network by an attacker with low privileges, such as a logged-in user, requiring low complexity and no user interaction. Successful exploitation allows arbitrary file reads, and when chained with the application's file upload functionality, enables remote code execution (RCE) with high impacts on confidentiality, integrity, and availability.

Mitigation details and advisories are documented in the GitHub repository at https://github.com/hungnqdz/CVE-2026-26746/blob/main/CVE-2026-26746.md, while the OpenSourcePOS project repository at https://github.com/opensourcepos/opensourcepos may provide patches or updates.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-7501

Vulnerability details

OpenSourcePOS 3.4.1 contains a Local File Inclusion (LFI) vulnerability in the Sales.php::getInvoice() function. An attacker can read arbitrary files on the web server by manipulating the Invoice Type configuration. This issue can be chained with the file upload functionality to…

achieve Remote Code Execution (RCE).

CWE(s): CWE-434

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

LFI vulnerability in public-facing web application enables arbitrary file reads over the network with low privileges and can chain to RCE, directly facilitating T1190: Exploit Public-Facing Application.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0