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CVE-2026-54163

MEDIUM
4.7
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-54163
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-11 21:46 UTC
Published
2026-07-17 20:19 UTC
Last updated
2026-07-17 20:19 UTC
Primary CWE
CWE-79
CWE-79: Improper Neutralization of Input During Web Page Gen…
Vendor / Product
github / secure_headers
Sources
cve.org  ·  NVD

Severity & Metrics

4.7 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products (1)
VendorProductPlatformVersions
github secure_headers — < 7.3.0
Weakness (CWE)
CWESourceDescription
CWE-113 cna CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CWE-79 cna CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS scores (1)
ScoreSeverityVersionSourceVector
4.7 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
References (3)
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