CVE-2026-45754mediumCWE-287 CWE-306

Symfony: Mailjet Mailer Webhook Parser Never Verifies the Configured Secret — Unauthenticated Webhook Event Injection

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.9epss 0.3%

exploitation probability

0.3%top 73% of all CVEs

observed exploitation

nono source reports it

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, the Mailjet mailer bridge and LOX24 notifier bridge webhook parsers received configured webhook secrets but did not verify them, allowing unauthenticated POST requests to inject forged Mailjet and LOX24 event payloads. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Affected products

symfony · lox24-notifier symfony · mailjet-mailer symfony · symfony

References

https://github.com/symfony/symfony/commit/3e52bf5ab733ee32e35eeeeb2631d859c941838e https://github.com/symfony/symfony/commit/4aaa45dd054f73445f1ab254968b7e60b546cc77 https://github.com/symfony/symfony/releases/tag/v6.4.40 https://github.com/symfony/symfony/releases/tag/v7.4.12 https://github.com/symfony/symfony/releases/tag/v8.0.12 https://github.com/symfony/symfony/security/advisories/GHSA-64hg-93w9-fc35