Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 14.7%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2026-48747
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cpe:2.3:a:sensiolabs:symfony:7.2.0
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cpe:2.3:a:sensiolabs:symfony:7.2.1
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cpe:2.3:a:sensiolabs:symfony:7.2.2
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cpe:2.3:a:sensiolabs:symfony:7.2.3
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cpe:2.3:a:sensiolabs:symfony:7.2.4
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cpe:2.3:a:sensiolabs:symfony:7.2.5
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cpe:2.3:a:sensiolabs:symfony:7.2.6
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cpe:2.3:a:sensiolabs:symfony:7.2.7
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cpe:2.3:a:sensiolabs:symfony:7.2.8
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cpe:2.3:a:sensiolabs:symfony:7.2.9
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cpe:2.3:a:sensiolabs:symfony:7.3.0
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cpe:2.3:a:sensiolabs:symfony:7.3.1
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cpe:2.3:a:sensiolabs:symfony:7.3.10
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cpe:2.3:a:sensiolabs:symfony:7.3.11
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cpe:2.3:a:sensiolabs:symfony:7.3.2
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cpe:2.3:a:sensiolabs:symfony:7.3.3
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cpe:2.3:a:sensiolabs:symfony:7.3.4
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cpe:2.3:a:sensiolabs:symfony:7.3.5
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cpe:2.3:a:sensiolabs:symfony:7.3.6
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cpe:2.3:a:sensiolabs:symfony:7.3.7
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cpe:2.3:a:sensiolabs:symfony:7.3.8
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cpe:2.3:a:sensiolabs:symfony:7.3.9
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cpe:2.3:a:sensiolabs:symfony:7.4.0
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cpe:2.3:a:sensiolabs:symfony:7.4.1
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cpe:2.3:a:sensiolabs:symfony:7.4.10
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cpe:2.3:a:sensiolabs:symfony:7.4.11
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cpe:2.3:a:sensiolabs:symfony:7.4.12
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cpe:2.3:a:sensiolabs:symfony:7.4.2
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cpe:2.3:a:sensiolabs:symfony:7.4.3
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cpe:2.3:a:sensiolabs:symfony:7.4.4
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cpe:2.3:a:sensiolabs:symfony:7.4.5
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cpe:2.3:a:sensiolabs:symfony:7.4.6
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cpe:2.3:a:sensiolabs:symfony:7.4.7
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cpe:2.3:a:sensiolabs:symfony:7.4.8
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cpe:2.3:a:sensiolabs:symfony:7.4.9
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cpe:2.3:a:sensiolabs:symfony:8.0.0
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cpe:2.3:a:sensiolabs:symfony:8.0.1
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cpe:2.3:a:sensiolabs:symfony:8.0.10
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cpe:2.3:a:sensiolabs:symfony:8.0.11
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cpe:2.3:a:sensiolabs:symfony:8.0.12
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cpe:2.3:a:sensiolabs:symfony:8.0.2
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cpe:2.3:a:sensiolabs:symfony:8.0.3
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cpe:2.3:a:sensiolabs:symfony:8.0.4
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cpe:2.3:a:sensiolabs:symfony:8.0.5
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cpe:2.3:a:sensiolabs:symfony:8.0.6
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cpe:2.3:a:sensiolabs:symfony:8.0.7
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cpe:2.3:a:sensiolabs:symfony:8.0.8
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cpe:2.3:a:sensiolabs:symfony:8.0.9