CVE-2026-54163

{"id": "CVE-2026-54163", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54163", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-20T17:45:32.192836Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 4.7, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 1.6}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "github", "product": "secure_headers", "versions": [{"status": "affected", "version": "< 7.3.0"}]}]}], "published": "2026-07-17T21:17:08.107", "references": [{"url": "https://github.com/github/secure_headers/commit/286a79dea80c6a9be4ca93e0f284c923cf77e539", "source": "security-advisories@github.com"}, {"url": "https://github.com/github/secure_headers/releases/tag/v7.3.0", "source": "security-advisories@github.com"}, {"url": "https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q", "source": "security-advisories@github.com"}, {"url": "https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-113"}]}], "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."}], "lastModified": "2026-07-23T18:04:31.947", "sourceIdentifier": "security-advisories@github.com"}