{"id":"CVE-2026-54163","summary":"secure_headers: CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input","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.","aliases":["GHSA-rqq5-2gf9-4w4q"],"modified":"2026-07-22T05:29:54.254812216Z","published":"2026-07-17T20:19:18.186Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54163.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-113","CWE-79"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/github/secure_headers","events":[{"introduced":"0"},{"fixed":"286a79dea80c6a9be4ca93e0f284c923cf77e539"},{"fixed":"65e2b4887eb3aea4184d078ef1a949b59977d29f"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"7.3.0"}]}}],"versions":["v7.2.0","v7.1.0","v7.0.0","v6.7.0","v6.6.0","v6.5.0","v6.4.0","v6.3.4","v6.3.3","v6.3.2","v6.3.1","v6.3.0","v6.2.0","v5.0.5","v6.1.2","v6.1.1","v6.1.0","v6.0.0.alpha03","v6.0.0.alpha02","v6.0.0.alpha01","v5.0.4","v5.0.3","v5.0.2","v5.0.1","v4.0.1","v5.0.0.alpha01","v4.0.0","v4.0.0.alpha04","v4.0.0.alpha03","v4.0.0.alpha02","v4.0.0.alpha01","v3.6.4","v3.6.3","v3.6.1","v3.6.0","v3.5.1","v3.5.0","v3.5.0.pre","v3.4.1","v3.4.0","v3.3.2","v3.3.1","v3.3.0","v3.2.0","v3.1.2","v3.1.1","v3.1.0","v3.0.3","v3.0.2","v3.0.1","v3.0.0","v3.0.0.rc1","2.4.4","2.4.3","2.4.2","2.4.1","2.4.0","2.3.0","2.2.4","2.2.3","2.2.2","2.2.1","2.2.0","v2.1.0","v2.0.2","v2.0.1","2.0.0","v.2.0.0.pre2","v1.3.4","v2.0.0.pre","v1.3.3","v1.3.2","v1.1.1","v0.4.3","v0.4.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54163.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}