# CVE-2026-48747

## Summary

- **CVE ID:** CVE-2026-48747
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-347, CWE-757
- **Published:** Jul 14, 2026
- **Last Modified:** Jul 15, 2026

## Description

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.

## Affected Products

- symfony — symfony (>= 7.2.0, < 7.4.12)
- symfony — symfony (>= 8.0.0-BETA1, < 8.0.13)
- symfony — mailomat-mailer (>= 7.2.0, < 7.4.12)
- symfony — mailomat-mailer (>= 8.0.0-BETA1, < 8.0.13)

## References

- [CNA](https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr)
- [CNA](https://github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88)
- [CNA](https://github.com/symfony/symfony/releases/tag/v7.4.13)
- [CNA](https://github.com/symfony/symfony/releases/tag/v8.0.13)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 15.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._