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Medium · 6.9 CVE-2026-47212 EUVD-2026-44369GHSA-55rj-x2vc-4whq

Symfony: Twilio Notifier Webhook Parser Never Verifies the X-Twilio-Signature HMAC: Unauthenticated Webhook Event Injection

Published Jul 14, 2026 · Updated Jul 15, 2026 · Assigned by GitHub_M

Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 6.4.40, 7.4.12, and 8.0.12, TwilioRequestParser::doParse() received the configured webhook secret but ignored the X-Twilio-Signature HMAC header, allowing unauthenticated POST requests to inject forged Twilio status payloads. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.

Affected products

VendorProductAffectedFixed
symfony symfony >= 6.4.0, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12 —
symfony twilio-notifier >= 6.4.0, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 symfony 7.4.12+dfsg-1 —
Debian 13 symfony 6.4.41+dfsg-0+deb13u1 —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 symfony No fix yet —
Ubuntu 26.04 LTS symfony No fix yet —
Ubuntu 25.10 symfony No fix yet —
Ubuntu 16.04 LTS symfony No fix yet —
Show 4 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 24.04 LTS symfony No fix yet —
Ubuntu Pro 22.04 LTS symfony No fix yet —
Ubuntu Pro 20.04 LTS symfony No fix yet —
Ubuntu Pro 18.04 LTS symfony No fix yet —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist symfony/symfony >= 6.4.0, < 6.4.40 6.4.40 GHSA-55rj-x2vc-4whq
Packagist symfony/symfony >= 7.0.0, < 7.4.12 7.4.12 GHSA-55rj-x2vc-4whq
Packagist symfony/symfony >= 8.0.0, < 8.0.12 8.0.12 GHSA-55rj-x2vc-4whq
Packagist symfony/twilio-notifier >= 6.4.0, < 6.4.40 6.4.40 GHSA-55rj-x2vc-4whq
Packagist symfony/twilio-notifier >= 7.0.0, < 7.4.12 7.4.12 GHSA-55rj-x2vc-4whq
Packagist symfony/twilio-notifier >= 8.0.0, < 8.0.12 8.0.12 GHSA-55rj-x2vc-4whq

References