{"id":"CVE-2026-54163","state":"PUBLISHED","title":"secure_headers: CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input","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.","publishedAt":"2026-07-17T20:19:18.186Z","updatedAt":"2026-07-20T17:45:49.353Z","severity":{"score":4.7,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["github secure_headers"],"affected":[{"vendor":"github","product":"secure_headers","versions":[{"version":"< 7.3.0","status":"affected"}]}],"references":["https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q","https://github.com/github/secure_headers/commit/286a79dea80c6a9be4ca93e0f284c923cf77e539","https://github.com/github/secure_headers/releases/tag/v7.3.0"],"weaknesses":["CWE-79","CWE-113"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54163.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54163","state":"PUBLISHED","datePublished":"2026-07-17T20:19:18.186Z","dateUpdated":"2026-07-20T17:45:49.353Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-11T21:46:52.380Z"},"containers":{"cna":{"title":"secure_headers: CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"github","product":"secure_headers","versions":[{"version":"< 7.3.0","status":"affected"}]}],"references":[{"url":"https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q","name":"https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/github/secure_headers/commit/286a79dea80c6a9be4ca93e0f284c923cf77e539","name":"https://github.com/github/secure_headers/commit/286a79dea80c6a9be4ca93e0f284c923cf77e539","tags":["x_refsource_MISC"]},{"url":"https://github.com/github/secure_headers/releases/tag/v7.3.0","name":"https://github.com/github/secure_headers/releases/tag/v7.3.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-113","lang":"en","description":"CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-17T20:19:18.186Z"},"source":{"advisory":"GHSA-rqq5-2gf9-4w4q","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-20T17:45:32.192836Z","id":"CVE-2026-54163","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-20T17:45:49.353Z"}}]}}}