CVE-2026-48747

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-07-14 20:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-15 15:16 UTC Last updatedMost recent change to the record

Details

Published

2026-07-14 20:17 UTC

Last modified

2026-07-15 15:16 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-347

Record status

Analyzed

Affected

• Sensiolabs Symfony < 7.4.13
• Sensiolabs Symfony < 8.0.13

Attack profile CVSS 4.0 · 6.3

Attack vector

Network

Complexity

High

Attack requirements

None

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

Low

Availability

None