github secure_headers up to 7.2.x Content-Security-Policy Builder sandbox/plugin_types/report_to cross site scripting

Summaryinfo

A vulnerability was found in github secure_headers up to 7.2.x. It has been declared as problematic. This issue affects the function build_sandbox_list_directive/build_media_type_list_directive/build_report_to_directive of the component Content-Security-Policy Builder. Executing a manipulation of the argument sandbox/plugin_types/report_to can lead to cross site scripting. This vulnerability is handled as CVE-2026-54163. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in github secure_headers up to 7.2.x and classified as problematic. This vulnerability affects the function build_sandbox_list_directive/build_media_type_list_directive/build_report_to_directive of the component Content-Security-Policy Builder. The manipulation of the argument sandbox/plugin_types/report_to with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-54163 since 06/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 7.3.0 eliminates this vulnerability.

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Productinfo

Type

• Bug Tracking Software

Vendor

• github

Name

• secure_headers

Version

• 7.0
• 7.1
• 7.2

License

• open-source

Website

• Product: https://github.com/github/secure_headers/

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