---
title: "CVE-2026-45754\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-45754?format=md
keywords: index, follow
---

# CVE-2026-45754

Publication date 14 July 2026

Last updated 17 July 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2026-45754?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| symfony | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-45754?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-45754?format=md)

**Base score**

6.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | None |
  | Privileges required | None |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | None |
  | Vulnerable system - Integrity impact | Low |
  | Vulnerable system - Availability impact | None |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.9 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** 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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-45754)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-45754)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-45754)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-45754)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-45754>
* <https://symfony.com/blog/cve-2026-45754-mailjet-and-lox24-webhook-parsers-never-verify-the-configured-secret-unauthenticated-event-injection>