CVE-2026-45755
Last modified
CVE-2026-45755 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Sensiolabs | Symfony | >= 7.2.0, < 7.4.12 |
| Sensiolabs | Symfony | >= 8.0.0, < 8.0.12 |
References
- https://github.com/symfony/symfony/releases/tag/v7.4.12Product, Release Notes
- https://github.com/symfony/symfony/releases/tag/v8.0.12Product, Release Notes
- https://github.com/symfony/symfony/security/advisories/GHSA-59f3-vp2f-mp9wPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-45755?
How severe is CVE-2026-45755?
How do I fix CVE-2026-45755?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-45748Termix is a web-based server management platform with SSH te…9.8
- CVE-2026-45749Termix is a web-based server management platform with SSH te…8.1
- CVE-2026-4575A flaw has been found in code-projects Exam Form Submission …2.4
- CVE-2026-45750Termix is a web-based server management platform with SSH te…9
- CVE-2026-45753Symfony is a PHP framework for web and console applications …6.1
- CVE-2026-45754Symfony is a PHP framework for web and console applications …5.3
- CVE-2026-45756Symfony is a PHP framework for web and console applications …7.5
- CVE-2026-45757Rocket.Chat is an open-source, secure, fully customizable co…2.3
- CVE-2026-45758Guardrails AI is a Python framework that helps build AI appl…9.6
- CVE-2026-4576A vulnerability has been found in code-projects Exam Form Su…2.4
- CVE-2026-45760(Externally Controlled Reference to a Resource in Another Sp…8.1
- CVE-2026-4577A vulnerability was found in code-projects Exam Form Submiss…2.4
Are you affected by CVE-2026-45755?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST