Reflected XSS in OSCAL-GUI via oscal-forms.php

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: VulnCheck

Description

OSCAL-GUI contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser by injecting malicious content through the project request parameter in oscal-forms.php. The parameter value is URL-decoded and assigned to the project_id variable without sanitization in oscal-functions.php, and when the supplied project ID is not found, the unsanitized value is concatenated into an error message via the Messages() function and reflected into the HTML response body without encoding.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-06-09

Last Modified

2026-06-09

Generated

2026-06-30

AI Q&A

2026-06-10

EPSS Evaluated

2026-06-28

NVD

CVE-2026-34417

EUVD

EUVD-2026-35841

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability is a reflected cross-site scripting (XSS) issue in OSCAL-GUI. It allows unauthenticated attackers to inject and execute arbitrary JavaScript code in a victim's browser. The attack works by sending malicious content through the project request parameter in the oscal-forms.php file. The parameter value is URL-decoded and assigned to a variable without proper sanitization. If the project ID is not found, the unsanitized value is included in an error message and reflected back into the HTML response without encoding, enabling the execution of the injected script.

Impact Analysis

This vulnerability can impact users by allowing attackers to execute arbitrary JavaScript in their browsers. This can lead to theft of sensitive information such as cookies or session tokens, unauthorized actions performed on behalf of the user, or redirection to malicious sites. Since the vulnerability is exploitable without authentication, it poses a risk to any user accessing the affected application.

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