EUVD-2026-51396Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Network-reachable without authentication but AC:H because exploitation requires specific misconfigured or absent proxy stripping of forwarding headers; low C/I impact as effect is security control bypass, not direct data access.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionCVE.org
CodeIgniter is a PHP full-stack web framework. In versions prior to 4.7.4, IncomingRequest::isSecure() trusted the X-Forwarded-Proto and Front-End-Https headers from any incoming request, allowing an attacker could spoof these headers and cause the application to incorrectly treat an HTTP request as secure. This may have impacted applications that rely on isSecure(), force_https(), forceGlobalSecureRequests, or similar logic to enforce HTTPS-only access or make security-sensitive decisions. Exploitability depends on deployment configuration. Applications are most exposed if the backend is reachable directly over HTTP, or if a reverse proxy/load balancer forwards client-supplied forwarding headers without stripping or overwriting them. This issue has been fixed in version 4.7.4.
AnalysisAI
HTTP security header spoofing in CodeIgniter4 prior to 4.7.4 allows remote unauthenticated attackers to trick the framework into treating plain HTTP requests as HTTPS by injecting forged X-Forwarded-Proto or Front-End-Https headers. The root cause is that IncomingRequest::isSecure() unconditionally trusted these headers from any source rather than restricting trust to configured trusted proxies, undermining isSecure(), force_https(), and forceGlobalSecureRequests enforcement logic. …
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Vulnerability AssessmentAI
| Exploitation | Exploitation requires one of two deployment conditions: (1) the CodeIgniter4 backend is directly reachable over HTTP without a reverse proxy, allowing attackers to send arbitrary headers directly to the application, OR (2) a reverse proxy or load balancer is in place but forwards client-supplied X-Forwarded-Proto or Front-End-Https headers to the backend without stripping or overwriting them - a common misconfiguration. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS score of 4.8 with vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N accurately reflects the conditional nature of exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a plain HTTP POST request directly to a CodeIgniter4 backend with the header X-Forwarded-Proto: https included in the request. Because the application's reverse proxy either does not strip client-supplied headers or is bypassed entirely, isSecure() returns true, causing force_https() or forceGlobalSecureRequests logic to treat the connection as secure and permit access to endpoints intended to be HTTPS-only. … |
| Remediation | Upgrade to CodeIgniter4 version 4.7.4, confirmed by the tagged release at https://github.com/codeigniter4/CodeIgniter4/releases/tag/v4.7.4 and the fixing commit at https://github.com/codeigniter4/CodeIgniter4/commit/ecbf044666bed41d23f07518096d9843fe6c08b0. … Detailed patch versions, workarounds, and compensating controls in full report. |
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