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CVE-2026-45754

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

MEDIUM
5.3
CVSS Score
Published: July 14, 2026 at 06:54 PM UTC
Updated: July 21, 2026 at 06:16 PM UTC
4 products affected across 2 vendorsSymfonySymfonyLox24-notifier

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Symfony· Sensiolabsdrupal
95%
6.4.0 ≤ v < 6.4.407.0.0 ≤ v < 7.4.128.0.0 ≤ v < 8.0.12
Affected range stops below 6.4.40, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.12, so it looks safe — our inference, not a vendor statement
Lox24-notifier· Symfony
60%
v < 7.4.12v < 8.0.12
Affected range stops below 7.4.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.12, so it looks safe — our inference, not a vendor statement
Mailjet Mailer· Symfony
60%
v < 6.4.40v < 7.4.12v < 8.0.12
Affected range stops below 6.4.40, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.12, so it looks safe — our inference, not a vendor statement
Symfony· Symfonycomposer
60%
v < 6.4.40v < 7.4.12v < 8.0.12
Affected range stops below 6.4.40, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.12, so it looks safe — our inference, not a vendor statement

References (6)

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-287CWE-306

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