Vulnerability DatabaseCVE-2026-48747
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CVE-2026-48747
Published:July 14, 2026
Updated:July 21, 2026
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 Packages
https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v8.0.0-BETA1 <v8.0.13
Fix Suggestion:
Update to version v8.0.13
https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v7.2.0-BETA1 <v7.4.13
Fix Suggestion:
Update to version v7.4.13
symfony/symfony (PHP):
Affected version(s) >=v8.0.0 <v8.0.13
Fix Suggestion:
Update to version v8.0.13
symfony/mailomat-mailer (PHP):
Affected version(s) >=v7.2.0 <v7.4.13
Fix Suggestion:
Update to version v7.4.13
symfony/mailomat-mailer (PHP):
Affected version(s) >=v7.2.0 <v7.4.13
Fix Suggestion:
Update to version v7.4.13
symfony/symfony (PHP):
Affected version(s) >=v7.2.0 <v7.4.13
Fix Suggestion:
Update to version v7.4.13
symfony/mailomat-mailer (PHP):
Affected version(s) =v8.0.0 <v8.0.13
Fix Suggestion:
Update to version v8.0.13
symfony/mailomat-mailer (PHP):
Affected version(s) =v8.0.0 <v8.0.13
Fix Suggestion:
Update to version v8.0.13
Related Resources (8)
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mailomat-mailer/CVE-2026-48747.yaml
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48747.yaml
https://github.com/symfony/symfony/releases/tag/v8.0.13
https://github.com/symfony/symfony
https://github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88
https://symfony.com/cve-2026-48747
https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr
https://github.com/symfony/symfony/releases/tag/v7.4.13
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
CWE-757
Improper Verification of Cryptographic Signature
CWE-347
EPSS
Base Score:
0.20