CVE-2026-54163
MediumCVSS 4.7Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
Vulnerability in secure_headers before version 7.3.0 allows CSP directive injection via unsanitized input in override_content_security_policy_directives and append APIs for :sandbox, :plugin_types, and :report_to. An attacker can inject a directive such as script-src 'unsafe-inline' * before the legitimate script-src, enabling XSS or CSP report exfiltration.
Risk Assessment
An attacker can perform XSS attacks or exfiltrate CSP reports, leading to malicious script execution in the victim's browser or data leakage.
Recommendation
Update secure_headers to version 7.3.0 or later.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS