Executive Summary

The vulnerability CVE-2026-12862 occurs in the venueless/venueless software where untrusted user data is passed directly and without proper neutralization to Excel exports intended for administrators.

This allows an attacker to perform formula injection attacks by embedding malicious formulas in the exported Excel files.

When an administrator opens such a file, the malicious formulas can execute and potentially compromise the user's environment or manipulate other data within the file.

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Impact Analysis

This vulnerability can impact you by allowing attackers to compromise the environment of users who open the exported Excel files.

The attack requires low privileges and passive user interaction, meaning it can be triggered relatively easily once the malicious file is opened.

While it does not affect confidentiality or availability, it poses a low risk to data integrity and could lead to unauthorized actions or data manipulation within the Excel file.

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Detection Guidance

This vulnerability involves untrusted user data being passed verbatim to Excel exports, allowing formula injection. Detection would involve identifying exported Excel files generated by the venueless software that may contain unneutralized formulas.

One approach is to inspect exported Excel files for suspicious formula entries that start with characters like '=', '+', '-', or '@' which are typical indicators of formula injection.

Commands to detect such formulas in exported files could include using tools like 'xlsx2csv' or 'xlsxgrep' to extract and search for formula patterns, or using scripting languages such as Python with libraries like openpyxl to scan cells for formula content.

• Example command using grep on CSV exports: grep -E '^(=|\+|-|@)' exported_file.csv
• Using Python openpyxl to scan Excel files for formulas in cells.

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Mitigation Strategies

To mitigate this vulnerability, update the venueless software to version 0a35457f or later, where the issue has been addressed.

Additionally, avoid opening Excel exports from untrusted sources or users until the software is updated.

Implement input validation or sanitization to neutralize any formula injection attempts in exported files.

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Compliance Impact

The vulnerability involves formula injection through Excel exports, which can compromise the environment of users opening the files or affect other data within those files.

Although the vulnerability poses a low risk to data integrity and does not impact confidentiality or availability, such risks could potentially affect compliance with standards like GDPR or HIPAA that require protection of data integrity and security.

However, there is no explicit information provided about direct impacts on compliance with these regulations.

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