GHSA-7ww3-xvf5-cxwm

Suggest an improvement
Source
https://github.com/advisories/GHSA-7ww3-xvf5-cxwm
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-7ww3-xvf5-cxwm/GHSA-7ww3-xvf5-cxwm.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-7ww3-xvf5-cxwm
Published
2026-05-05T22:20:04Z
Modified
2026-05-05T22:36:43Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N CVSS Calculator
  • 2.1 (Low) CVSS_V4 - 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 CVSS Calculator
Summary
ciguard: Web UI is missing HTTP defence-in-depth headers
Details

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

Database specific 
{
    "cwe_ids":  [
        "CWE-693"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-05-05T22:20:04Z",
    "nvd_published_at":  null,
    "severity":  "LOW"
}
References

Affected packages

PyPI / ciguard

Package

Name
ciguard
View open source insights on deps.dev
Purl
pkg:pypi/ciguard

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0.1.0
Fixed
0.8.2

Affected versions

0.*
0.1.0
0.1.1
0.1.2
0.1.3
0.1.4
0.2.0
0.2.1
0.3.0
0.4.0
0.4.1
0.5.0
0.6.0
0.6.1
0.7.0
0.8.1

Database specific

last_known_affected_version_range 
"<= 0.8.1"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-7ww3-xvf5-cxwm/GHSA-7ww3-xvf5-cxwm.json"