Vulnerability · Published Jun 9, 2026 · Assigned by VulnCheck

CVE-2026-34417OSCAL-GUI Reflected XSS via project parameter in oscal-forms.php

Medium 6.1

In plain English

A medium-severity cross-site scripting in OSCAL-GUI from brian-ruf. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.2%top 93.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
brian-ruf	OSCAL-GUI	0 – through c989c4bd5a68f2621a81654e9250246539a28d5a

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

https://gist.github.com/cyberinforepo/5a8d369a005826b6b42bfeed9607c2dd technical-description, exploit
https://www.vulncheck.com/advisories/oscal-gui-reflected-xss-via-project-parameter-in-oscal-forms-php third-party-advisory