Vulnerability Description
secure_headers manages application of security headers with many safe defaults. Prior to 7.3.0, secure_headers builds the Content-Security-Policy value by stitching directives with ; separators, and build_sandbox_list_directive, build_media_type_list_directive, and build_report_to_directive interpolate caller-supplied strings without scrubbing ;, \r, or \n. When untrusted input reaches SecureHeaders.override_content_security_policy_directives or append APIs for :sandbox, :plugin_types, or :report_to, an attacker can inject a CSP directive such as script-src 'unsafe-inline' * before the legitimate script-src, enabling XSS reachability through these sinks or CSP report exfiltration. This issue is fixed in version 7.3.0.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/github/secure_headers/commit/286a79dea80c6a9be4ca93e0f284c923
- https://github.com/github/secure_headers/releases/tag/v7.3.0
- https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q
- https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q
FAQ
What is CVE-2026-54163?
CVE-2026-54163 is a vulnerability with a CVSS score of 4.7 (MEDIUM). secure_headers manages application of security headers with many safe defaults. Prior to 7.3.0, secure_headers builds the Content-Security-Policy value by stitching directives with ; separators, and b...
How severe is CVE-2026-54163?
CVE-2026-54163 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54163?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.