CVE-2026-45755 Details
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.
A vulnerability exists in the Symfony Mailtrap Mailer Bridge webhook request parser, specifically in versions 7.2 through 7.4.11 and 8.0 prior to 8.0.12. The issue arises because the parser's 'doParse' method receives the configured webhook secret but fails to verify the 'X-Mt-Signature' HMAC header. This oversight allows unauthenticated POST requests to inject fake Mailtrap delivery, bounce, open, click, or spam events. As a result, applications can experience corruption of suppression lists and fraudulent delivery metrics.
Users can update to Symfony versions 7.4.12 or 8.0.12, both of which include the necessary patch. Instructions for updating can be found in the Symfony release notes.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/symfony/symfony/commit/4e0467e4e182cf2e704a3d9e1bc1a6be65d52ab8 | [email protected] | Patch |
| https://github.com/symfony/symfony/releases/tag/v7.4.12 | [email protected] | ProductRelease Notes |
| https://github.com/symfony/symfony/releases/tag/v8.0.12 | [email protected] | ProductRelease Notes |
| https://github.com/symfony/symfony/security/advisories/GHSA-59f3-vp2f-mp9w | [email protected] | PatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
| CWE-347 | Improper Verification of Cryptographic Signature | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| sensiolabs symfony | >= 7.2.0, < 7.4.12 >= 8.0.0, < 8.0.12 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | Initial Analysis | [email protected] |
| Jul 14, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | New CVE Received | [email protected] |