SSRF via unvalidated redirects in fetch handlers
Published Aug 31, 2026 · Updated Sep 2, 2026
SSRF in Smarty before 4.5.7 and 5.0.0 through 5.8.1 allows remote attackers to reach internal endpoints via a crafted fetch target. The {fetch} handlers validate only the initial URL against trusted_uri, then file_get_contents() follows an HTTPS redirect without revalidating its destination. Exploitation requires an active security policy, attacker influence over the fetch target, and an open redirect on an allowlisted host; the server can then read from an attacker-chosen internal endpoint.
Summary
What happened
SSRF in Smarty before 4.5.7 and 5.0.0 through 5.8.1 allows remote attackers to reach internal endpoints via a crafted fetch target. The {fetch} handlers validate only the initial URL against trusted_uri, then file_get_contents() follows an HTTPS redirect without revalidating its destination. Exploitation requires an active security policy, attacker influence over the fetch target, and an open redirect on an allowlisted host; the server can then read from an attacker-chosen internal endpoint.
The record
- CVE
- CVE-2026-62993
- Published
- Aug 31, 2026
- Updated
- Sep 2, 2026
- Vendor
- Smarty
- Product
- Smarty
- Classifications
- CWE-918
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 31, 2026CVE publishedPublication date reported by the CVE source.
- Sep 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 4.5.7
- Affected versionversion=>= 5.0.0, < 5.8.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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