EUVD-2026-68814
GHSA-cq55-c7wv-pxmq
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack requires open redirect on trusted host (AC:H); SSRF reads subsequent-system internal resources with high confidentiality impact (S:C, C:H); no integrity or availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to 4.5.7 and 5.8.2, depending on the release line, Smarty's {fetch} handling in libs/plugins/function.fetch.php and src/FunctionHandler/Fetch.php used Security::isTrustedUri() to validate only the initial remote URL against trusted_uri when a security policy was active. For resources handled by file_get_contents(), including HTTPS URLs, PHP followed HTTP redirects by default. An attacker who could supply or influence a fetch target and had an open redirect on a trusted host could redirect the request to an attacker-chosen internal endpoint, bypass the trusted_uri allowlist, and perform server-side request forgery. This issue is fixed in versions 4.5.7 and 5.8.2.
AnalysisAI
Server-side request forgery in Smarty's {fetch} template function (versions prior to 4.5.7 on the 4.x line and 5.8.2 on the 5.x line) allows network-accessible attackers to bypass the trusted_uri allowlist and reach arbitrary internal endpoints by exploiting PHP's default redirect-following behavior. The security policy's isTrustedUri() check validates only the initial URL; when file_get_contents() silently follows an HTTP redirect placed on a trusted host, the request lands on an attacker-chosen internal target, enabling SSRF to services such as cloud metadata endpoints or internal APIs. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Three conditions must all be satisfied simultaneously: (1) Smarty's security policy must be active - the redirect-following bug is only reachable in the code path that checks isTrustedUri(), which is invoked only when $template->smarty->security_policy is set; applications that do not enable a Smarty security policy are not affected by this specific bypass but may have broader template injection exposure. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 (Medium) accurately reflects the chained-exploit nature of this vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Smarty to version 4.5.7 (4.x line) or 5.8.2 (5.x line); these are the vendor-released patched versions confirmed by GitHub tagged releases at https://github.com/smarty-php/smarty/releases/tag/v4.5.7 and https://github.com/smarty-php/smarty/releases/tag/v5.8.2. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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