{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "7.3.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "286a79dea80c6a9be4ca93e0f284c923cf77e539"
            },
            {
              "fixed": "65e2b4887eb3aea4184d078ef1a949b59977d29f"
            }
          ],
          "repo": "https://github.com/github/secure_headers",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rqq5-2gf9-4w4q"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-113",
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54163.json"
  },
  "details": "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.",
  "id": "CVE-2026-54163",
  "modified": "2026-07-22T05:29:54.254812216Z",
  "published": "2026-07-17T20:19:18.186Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/github/secure_headers/releases/tag/v7.3.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54163.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54163"
    },
    {
      "type": "FIX",
      "url": "https://github.com/github/secure_headers/commit/286a79dea80c6a9be4ca93e0f284c923cf77e539"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "secure_headers: CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input"
}