CVE-2026-45755
MEDIUMSymfony: Mailtrap Mailer Webhook Parser Never Verifies the X-Mt-Signature HMAC — Unauthenticated Webhook Event Injection
Title source: cnaDescription
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.12 and 8.0.12, MailtrapRequestParser::doParse() received the configured webhook secret but ignored the X-Mt-Signature HMAC header, allowing unauthenticated POST requests to inject forged Mailtrap delivery, bounce, open, click, or spam events. This issue is fixed in versions 7.4.12 and 8.0.12.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/symfony/symfony/security/advisories/GHSA-59f3-vp2f-mp9w
X_Refsource_Misc x_refsource_misc
https://github.com/symfony/symfony/commit/4e0467e4e182cf2e704a3d9e1bc1a6be65d52ab8
X_Refsource_Misc x_refsource_misc
https://github.com/symfony/symfony/releases/tag/v7.4.12
X_Refsource_Misc x_refsource_misc
https://github.com/symfony/symfony/releases/tag/v8.0.12
Scores
CVSS v3
5.3
EPSS
0.0024
EPSS Percentile
15.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-306
CWE-347
Status
published
Products (5)
/mailtrap-mailer/mailtrap-mailer
>= 7.2.0, < 7.4.12
/mailtrap-mailer/mailtrap-mailer
>= 8.0.0-BETA1, < 8.0.12
sensiolabs/symfony
7.2.0 - 7.4.12
symfony/symfony
>= 7.2.0, < 7.4.12
symfony/symfony
>= 8.0.0-BETA1, < 8.0.12
Published
Jul 14, 2026
Tracked Since
Jul 15, 2026