CVE-2026-45074 in Symfony Security HTTP
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 7.1.0 until 7.4.12 and 8.0.12, Cas2Handler builds the CAS service parameter from Request::getSchemeAndHttpHost(), which reflects an attacker-controlled...
Quick answer
Symfony Security HTTP 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
- symfony/security-http >=7.1 <7.4.12
- symfony/security-http >=8.0 <8.0.12
Fixed versions
- symfony/security-http 7.4.12 or 8.0.12
How to fix it
Update Symfony Security HTTP. The old package can let a bad request slow the app, pass a login check, or run unsafe data.
- Update symfony/security-http to symfony/security-http 7.4.12 or 8.0.12 with Composer.
- Run the app tests.
- Clear Symfony cache and deploy.
- Check the app logs after release.
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Verify the fix
- Run composer show symfony/security-http and confirm the fixed version is installed.
- Scan again and confirm CVE-2026-45074 is gone.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-45074?
Symfony Security HTTP versions listed as affected should be reviewed: symfony/security-http >=7.1 <7.4.12, symfony/security-http >=8.0 <8.0.12.
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.