CVE-2026-54163
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
49/100
Published: 2026-07-17
Modified: 2026-10-24
First seen: 2026-10-29
Status: active
Attack Surface
Network
No Auth
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
None
UI:
Required
S:
Changed
C:
Low
I:
Low
A:
None
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.