Medium 6.9Published Jul 14, 2026

CVE-2026-45754Symfony: Mailjet Mailer Webhook Parser Never Verifies the Configured Secret — Unauthenticated Webhook Event Injection

Updated under an hour ago (Oct 26, 2026, 6:23 AM ET)

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It affects symfony and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for symfony

Exploited in the last 30 days

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: 6.9 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-287, CWE-306
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

symfony symfony symfony:symfony (from the name)	from 6.4.0, < 6.4.40; from 7.0.0-BETA1, < 7.4.12; from 8.0.0-BETA1, < 8.0.12	CNA record
symfony lox24-notifier symfony:lox24_notifier (from the name)	from 7.1.0-BETA1, < 7.4.12; from 8.0.0-BETA1, < 8.0.12	CNA record
symfony mailjet-mailer symfony:mailjet_mailer (from the name)	from 6.4.0, < 6.4.40; from 7.0.0-BETA1, < 7.4.12; from 8.0.0-BETA1, < 8.0.12	CNA record
sensiolabs symfony sensiolabs:symfony	from 6.4.0 before 6.4.40; from 7.0.0 before 7.4.12; from 8.0.0 before 8.0.12	NVD

References

https://github.com/symfony/symfony/security/advisories/GHSA-64hg-93w9-fc35x-refsource-confirm, patch, vendor-advisory
https://github.com/symfony/symfony/commit/3e52bf5ab733ee32e35eeeeb2631d859c941838ex-refsource-misc, patch
https://github.com/symfony/symfony/commit/4aaa45dd054f73445f1ab254968b7e60b546cc77x-refsource-misc, patch
https://github.com/symfony/symfony/releases/tag/v6.4.40x-refsource-misc, release-notes
https://github.com/symfony/symfony/releases/tag/v7.4.12x-refsource-misc, release-notes
https://github.com/symfony/symfony/releases/tag/v8.0.12x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.