CVE-2026-48747
Fixed in a distro release EPSS <1%CVSS 6.3
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.13 and 8.0.13, MailomatRequestParser::validateSignature() parsed X-MOM-Webhook-Signature as algo=signature and passed the request-selected algorithm to hash_hmac(), allowing a signature algorithm downgrade instead of enforcing Mailomat's documented SHA-256 webhook signature. This issue is fixed in versions 7.4.13 and 8.0.13.
Products: symfony, symfony mailomat-mailer
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Packagist | symfony/mailomat-mailer | 7.4.13 |
| Packagist | symfony/mailomat-mailer | 8.0.13 |
| Packagist | symfony/symfony | 7.4.13 |
| Packagist | symfony/symfony | 8.0.13 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian:14 | symfony | 7.4.13+dfsg-1 |
| Ubuntu:16.04:LTS | symfony | no fix |
| Ubuntu:25.10 | symfony | no fix |
| Ubuntu:26.04:LTS | symfony | no fix |
| Ubuntu:26.10 | symfony | no fix |
| Ubuntu:Pro:18.04:LTS | symfony | no fix |
| Ubuntu:Pro:20.04:LTS | symfony | no fix |
| Ubuntu:Pro:22.04:LTS | symfony | no fix |
| Ubuntu:Pro:24.04:LTS | symfony | no fix |