CVE-2026-48747

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88	Patch
https://github.com/symfony/symfony/releases/tag/v7.4.13	Product Release Notes
https://github.com/symfony/symfony/releases/tag/v8.0.13	Product Release Notes
https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:sensiolabs:symfony::::::::
	cpe:2.3:a:sensiolabs:symfony::::::::

History

No history.

Information

Published : 2026-07-14 20:17

Updated : 2026-07-15 15:16

NVD link : CVE-2026-48747

Mitre link : CVE-2026-48747

CVE.ORG link : CVE-2026-48747

JSON object : View

Products Affected

sensiolabs

symfony

CWE

CWE-347

Improper Verification of Cryptographic Signature

CWE-757

Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

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