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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.

PUBLISHED Reserved 2026-05-22 | Published 2026-07-14 | Updated 2026-07-14 | Assigner GitHub_M




MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-347: Improper Verification of Cryptographic Signature

CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

Product status

>= 7.2.0, < 7.4.12
affected

>= 8.0.0-BETA1, < 8.0.13
affected

>= 7.2.0, < 7.4.12
affected

>= 8.0.0-BETA1, < 8.0.13
affected

References

github.com/...ymfony/security/advisories/GHSA-rrj9-5q2j-4gvr

github.com/...ommit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88

github.com/symfony/symfony/releases/tag/v7.4.13

github.com/symfony/symfony/releases/tag/v8.0.13

cve.org (CVE-2026-48747)

nvd.nist.gov (CVE-2026-48747)

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