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 craft a malicious URL containing unsanitized input that breaks out of the JavaScript string and HTML attribute context in the body onload event handler to execute arbitrary scripts when the link is visited by a victim.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (25.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Brian-Ruf Oscal-Gui — versions 0
Weakness classification (CWE)
References
- gist.github.com/cyberinforepo/5a8d369a005826b6b42bfeed9607c2dd (technical-description, exploit)
- www.vulncheck.com/advisories/oscal-gui-reflected-xss-via-project-parameter-in-o… (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.