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CVE-2026-54163— secure_headers: CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input

Quick assessment

Affected
github secure_headers
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GitHub Secure Headers是美国GitHub公司的一系列Web中间件安全防护工具。 GitHub Secure Headers 7.3.0之前版本存在安全漏洞，该漏洞源于在构建Content-Security-Policy值时未清理;、\r、\n字符，当不受信任的输入通过SecureHeaders.override_content_security_policy_directives或append API传递时，攻击者可能注入CSP指令，导致跨站脚本攻击或CSP报告泄露。

CVSS 4.7 · Medium EPSS 0.29% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
github secure_headers < 7.3.0 affected
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I. Basic Information for CVE-2026-54163

Vulnerability Information
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Vulnerability Title
secure_headers: CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Secure Headers 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub Secure Headers是美国GitHub公司的一系列Web中间件安全防护工具。 GitHub Secure Headers 7.3.0之前版本存在安全漏洞，该漏洞源于在构建Content-Security-Policy值时未清理;、\r、\n字符，当不受信任的输入通过SecureHeaders.override_content_security_policy_directives或append API传递时，攻击者可能注入CSP指令，导致跨站脚本攻击或CSP报告泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
github secure_headers < 7.3.0 -

II. Public POCs for CVE-2026-54163

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III. Intelligence Information for CVE-2026-54163

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Patches & Fixes for CVE-2026-54163 (1)

Vendor Advisories for CVE-2026-54163 (1)

Vendor Pages for CVE-2026-54163 (1)

Same Patch Batch · github · 2026-07-17 · 4 CVEs total

CVE-2026-15343 Path traversal vulnerability in GitHub Enterprise Server allowed writing files to arbitrar
CVE-2026-15007 Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via
CVE-2026-15783 Missing Authorization vulnerability was identified in GitHub Enterprise Server that allowe

IV. Related Vulnerabilities

Same product: secure_headers
Same vendor: github
Same weakness: CWE-79

V. Comments for CVE-2026-54163

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