AIKIDO-2026-10874
symfony/mailjet-mailer is vulnerable to Improper Authentication
65
Medium Risk
This Affects:
symfony/mailjet-mailerTL;DR
Symfony webhook parsers receive configured provider secrets but do not enforce the expected webhook authentication. A forged POST to an application webhook endpoint is decoded and accepted as a provider event. Pre-fix applications can process fake delivery, bounce, spam, click, or status events. The fix requires provider-specific credentials or tokens before accepting the webhook.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
symfony/mailjet-mailer is vulnerable to Improper Authentication in versions 6.4.0 - 6.4.39, 7.0.0 - 7.4.11 and 8.0.0 - 8.0.11.
How to fix this
Upgrade the symfony/mailjet-mailer and/or symfony/symfony library to the patch version.
Are You Affected?
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SOC 2Compliant
ISO 27001Compliant