What is CVE-2026-34416?

CVE-2026-34416 is a medium-severity vulnerability in Brian-ruf Oscal-gui, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-09.

How severe is CVE-2026-34416?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Brian-ruf Oscal-gui

CVE-2026-34416

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 input through the project request parameter. Attackers can…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (9.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Brian-ruf Oscal-gui — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-34416?: CVE-2026-34416 is a medium-severity vulnerability in Brian-ruf Oscal-gui, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-09.
How severe is CVE-2026-34416?: Medium severity. CVSS v3 base score is 6.1 out of 10.