Sandbox policy bypass via unguarded string coercion
Published Jul 14, 2026 · Updated Jul 14, 2026
Sandbox bypass in Twig before 3.27.0 allows remote authenticated users to invoke disallowed __toString() methods through crafted templates. SandboxExtension stops recursion at arrays, while join, replace, in, and not in later coerce unchecked Stringable objects from Traversable values or operands. Exploitation requires control of a sandboxed template and access to objects in its render context; consequences are disallowed method side effects and string disclosure.
Summary
What happened
Sandbox bypass in Twig before 3.27.0 allows remote authenticated users to invoke disallowed __toString() methods through crafted templates. SandboxExtension stops recursion at arrays, while join, replace, in, and not in later coerce unchecked Stringable objects from Traversable values or operands. Exploitation requires control of a sandboxed template and access to objects in its render context; consequences are disallowed method side effects and string disclosure.
The record
- CVE
- CVE-2026-48807
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Twig
- Product
- Twig
- Classifications
- CWE-863, CWE-693
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.27.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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