AIKIDO-2026-10873
symfony/mailtrap-mailer is vulnerable to Missing Authentication
65
Medium Risk
This Affects:
symfony/mailtrap-mailerTL;DR
MailtrapRequestParser receives the configured webhook secret but does not verify the X-Mt-Signature header. A forged POST to an application webhook endpoint is decoded and accepted as a Mailtrap event. Pre-fix applications can process fake delivery, bounce, open, click, or spam events. The fix verifies the Mailtrap HMAC signature before decoding the payload.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
symfony/mailtrap-mailer is vulnerable to Missing Authentication in versions 7.2.0 - 7.4.11 and 8.0.0 - 8.0.11.
How to fix this
Upgrade the symfony/mailtrap-mailer and/or symfony/symfony library to the patch version.
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SOC 2Compliant
ISO 27001Compliant