> CVE-2026-48747 [MEDIUM]

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PUBLISHED
2026-07-14 20:17
MODIFIED
2026-07-14 20:25
CVSS_SCORE V3
6.3
EPSS (Prob. Exploit)
0.25%
Top 84.8%
DATA SOURCES:
NVD 🔗 2026-07-14 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-11-05 OSV 🔗 2026-11-02

> 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

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
High (H)
Conditions spécifiques doivent être réunies pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
Low
Modification limitée des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-347 CWE-757

> CWE DETAILED DESCRIPTIONS

CWE-347: Improper Verification of Cryptographic Signature - The product does not verify, or incorrectly verifies, the cryptographic signature for data. | CWE-757: Selection of Less-Secure Algorithm During Negotiation - A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used in a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties.

> GITHUB SECURITY ADVISORY

GHSA-rrj9-5q2j-4gvr MODERATE

Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade

AFFECTED PACKAGES:
COMPOSER / symfony/symfony
>= 8.0.0, < 8.0.13
Fixed in: 8.0.13
COMPOSER / symfony/symfony
>= 7.2.0, < 7.4.13
Fixed in: 7.4.13
COMPOSER / symfony/mailomat-mailer
>= 8.0.0, < 8.0.13
Fixed in: 8.0.13
COMPOSER / symfony/mailomat-mailer
>= 7.2.0, < 7.4.13
Fixed in: 7.4.13

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade

AFFECTED PACKAGES:
Unknown / Unknown
32 versions affected
ALIASES:
GHSA-rrj9-5q2j-4gvr

> HISTORIQUE DES MODIFICATIONS

Première apparition
14/07/2026 20:17
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-347: Improper Verification of Cryptographic Signature - The product does not verify, or incorrectly verifies, the cryptographic signature for data. | CWE-757: Selection of Less-Secure Algorithm Du...
Nouvelle valeur:
CWE-347: Improper Verification of Cryptographic Signature - The product does not verify, or incorrectly verifies, the cryptographic signature for data. | CWE-757: Selection of Less-Secure Algorithm Du...
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-347: Improper Verification of Cryptographic Signature - The product does not verify, or incorrectly verifies, the cryptographic signature for data. | CWE-757: Selection of Less-Secure Algorithm Du...
Total des modifications: 2 Dernière mise à jour: 5 days ago

> REFERENCES

https://github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c...
https://github.com/symfony/symfony/releases/tag/v7.4.13
https://github.com/symfony/symfony/releases/tag/v8.0.13
https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr
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