CVE-2026-48807 twig vulnerability
Twig is a template language for PHP. Prior to 3.27.0, the sandbox __toString() checks do not fully cover Traversable values passed to join and replace filters or operands evaluated by the in and not in operators, allowing contained Stringable objects to be coerced to strings without consulting the sandbox policy. This issue is fixed in version 3.27.0.
Quick answer
symfony twig should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Review vendor advisory for affected versions.
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-48807 affects symfony twig and is rated high. Twig is a template language for PHP. Fix this first on exposed systems, shared services, and user-facing workflows. The practical fix is to upgrade Symfony Twig to 3.27.0 or a later patched release, then verify the risky path is closed.
- Inventory every server, app, package, desktop, device, container, or workflow that uses symfony twig.
- Check the installed version and configuration against CVE-2026-48807 and the linked advisory.
- Apply the vendor fix: upgrade Symfony Twig to 3.27.0 or a later patched release.
- Treat sandboxed template editing as trusted-only until Twig is patched.
- Disable or isolate the affected feature if you cannot update right away.
- Review template changes, sandbox policy changes, and unexpected property or callable access.
- Rotate secrets, rebuild affected systems, or reset sessions if you suspect compromise.
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Verify the fix
- Confirm symfony twig is running the patched version or the approved mitigation is active.
- Confirm affected public, admin, API, desktop, storage, or device access is limited to trusted users.
- Repeat a safe test of the risky workflow and confirm the issue no longer appears.
- Review logs after the fix for crashes, bypass attempts, file access, or suspicious changes.
- Save version, config, log, and scan evidence for your remediation record.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-48807?
symfony twig should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.