{"cve":"CVE-2026-54163","nvd":{"published":"2026-07-17T21:17:08.107","modified":"2026-10-24T20:10:00.137","status":"Deferred","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","score":4.7},"cwes":["CWE-79","CWE-113"],"references":["https://github.com/github/secure_headers/commit/286a79dea80c6a9be4ca93e0f284c923cf77e539","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"],"products":[],"source":"nvd","synced_at":"2026-10-25T17:50:08.599881581+00:00"},"epss":{"cve":"CVE-2026-54163","score":0.00214,"percentile":0.11614,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-rqq5-2gf9-4w4q","url":"https://osv.dev/vulnerability/GHSA-rqq5-2gf9-4w4q","summary":"Secure Headers: CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input","modified":"2026-07-10T20:56:35.922897Z","packages":[{"ecosystem":"RubyGems","name":"secure_headers","purl":"pkg:gem/secure_headers","ranges":["<7.3.0"],"fixed":["7.3.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}