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GHSA-7ww3-xvf5-cxwm

MediumCVSS 4.3 / 10
Published May 5, 2026·Last modified May 5, 2026
Affected Components(0)

No affected components available

Description

Summary

ciguard's FastAPI Web UI (src/ciguard/web/app.py) does not set HTTP defence-in-depth headers. OWASP ZAP baseline scan flagged 11 alerts: missing Content-Security-Policy (Medium), X-Frame-Options (Medium), Sub-Resource-Integrity on /api/docs (Medium), COOP / COEP / CORP (Low), Permissions-Policy (Low), X-Content-Type-Options (Low).

Threat scenario

For local-only deployment (current intent): minimal — there's no untrusted browser context, no third-party hosting, no auth surface to protect.

For public hosting (PRD Slice 9 GitHub App or hosted dashboard, future): each missing header reduces a defence layer:

  • Missing CSP → injected XSS would have no second-line defence (first-line Jinja autoescape remains intact)
  • Missing X-Frame-Options → clickjacking against any UI button would be possible
  • Missing SRI on jsdelivr-hosted Swagger UI → if jsdelivr were compromised, attacker JS would run in the docs page context

Patch

  • New SecurityHeadersMiddleware at src/ciguard/web/security_headers.py injecting: X-Content-Type-Options nosniff, X-Frame-Options DENY, Referrer-Policy no-referrer, Permissions-Policy interest-cohort=(), Cross-Origin-Opener-Policy same-origin, Cross-Origin-Resource-Policy same-origin, plus per-path CSP with /api/docs + /api/redoc carve-out for cdn.jsdelivr.net (Swagger UI / ReDoc dependency).
  • COEP intentionally NOT set: would break Swagger UI's cross-origin assets, and ciguard makes no SharedArrayBuffer use that would benefit.
  • Registered via app.add_middleware(SecurityHeadersMiddleware).
  • 6 regression tests in tests/test_web.py::TestSecurityHeaders.

Discovery

Found by OWASP ZAP baseline scan during ciguard's first self-conducted pentest cycle, 2026-04-26.

CVSS Scoring

  • CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N — 4.3 (Medium per v3.1 thresholds)
  • CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N — first.org calc 4.3 (Low); GitHub's calc 2.1 (Low). All consistent at Low/borderline.

Verification

$ curl -sI http://127.0.0.1:8080/ | grep -E '^(X-Frame|X-Content|Referrer|Permissions|Cross-Origin|Content-Security):'
# Pre-fix: empty
# Post-fix: 7 headers present

Resources

Risk Scores
Base Score
4.3

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a low impact on the integrity of the data.

Threat Intelligence
4.0

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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